system
Given the following post, respond as if you're commenting on Reddit:
human
CMV: Neo gender identities such as non-binary and genderfluid are contrived and do not hold any coherent meaning.

EDIT 3: Yeah this has pretty much run its course now and I'm going to leave it here. I just wanted to do this last note at the top to summarise my thoughts at this point:

 - Some people, like me in the opening post, define gender or gender identity as inherently of the relation between your physical sex and perception of self. One thing I've gained from comments here is that what I might class as dysphoria isn't as simple as I had thought and some people have explained identifying as non-binary or something other than male/female in degrees of dysphoria or different types of it which I hadn't considered or been aware of, so that's helped my understanding of those terms from that angle.
 - Other people define and relate to gender strictly in terms of culture, social expectations and their relation to the world around them. They identify in non-binary terms because of how they deviate from or feel those norms don't apply to them. I'm still a little "jury out" in my mind on whether I would personally class that as a gender identity, but it's certainly been insightful in how these terms can be valid simply insofar as not everyone means the same thing when they talk about gender.
 - Another thing that came from the above was numerous contributors made reference to other cultures which include genders besides male and female in some form. To be honest, without being an expert on each and every one of those cultures, I can't really say to what extent that's relevant in the application of gender and gender identity in modern Western culture and society. I certainly take the point that it underscores how conceptions of gender can vary depending on when and where you are, but that there may be other cultures which recognise three, four or a million genders isn't really a point of contention to me or what I was asking people to "change my view" on, because I was specifically asking about how people use those terms here and today...I mean, unless you're saying what you mean when you identify as non-binary is the same thing the Navajo tribe mean by two-spirit so I should read up on that, I'm just not sure it really tells me much.
 - Yes, I still believe there are "snowflakes" in the world, people for whom these labels are nothing more than a teenage fad, or a way of claiming victimhood. But I have also learned that assuming anyone using terms like non-binary, genderfluid, femme etc. falls in to this attention-seeking category is indeed a deep misconception on my part. I was actually surprised at how little resentment, anger, offence or reactionary calling me a Nazi took place for asking these questions in what I expected to be an extremely touchy subject (I mean, it did happen, but it was very few people), but it is one I wanted to explore and understand better. The overwhelming majority of you were very friendly, sincere and I got a lot of positive understanding and human engagement out of it. Very grateful to you for that.
 - My biggest outstanding question or thought on this is I still wonder to what extent the ever growing vocabulary around not just gender but broader identity is actually helpful as sociopolitical discourse. I guess I think when you develop these increasingly specialised and numerous terms for identity characteristics, whether intentional or not you run the risk of further dividing and segregating people, boxing in their personalities to arbitrary labels and even pitting them against each in competition for recognition and resources. And yet that seems like the opposite of what you would want to happen. So yeah, well I wouldn't blanket dismiss identity politics and advocacy based around identity as universally a bad thing, I think it comes with a lot of caveats and is something you should do with caution.

Thanks to all who took part.

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Gender identity in the mainstream, until a few years ago, was defined exclusively in terms of male and female (the gender binary). We also obviously had awareness of transgender people, who experience body dysphoria, an innate sense they were born as the wrong sex and in many cases, take steps to live and present as the sex they believe they should be. There are also a very small proportion of people who are clinically intersex, which depending on what form and to what degree may or may not impact whether they can be distinctly classified as male or female.

None of the above is a controversial "change my view" thing for me; the existence of trans people and intersex people is self evident, as is that they do not necessarily fit the distinctly male or female gender identity in which the vast majority of people fall.

More recently, however, we have seen the widespread adoption in mainstream discourse of ideas like "non-binary", "genderfluid", "gender is a spectrum" etc., or even that you don't need dysphoria to be trans (this last one is especially bizarre to me, as I would say being transgender by definition requires you to experience body dysphoria).

That I do not get. To me it seems like contrived attention seeking. Either it does not really mean anything coherent, or when people who espouse these views are referring to gender and gender identity, they mean something totally different by those terms than I do.

For example, if I were to say my gender identity is male, what I mean by that is the combination of the following two things:

1. I am physically, biologically male and have the corresponding physical traits to that sex.

2. There is no disconnect between my body and sense of self; no part of my body or its maleness feels "wrong" or like it doesn't belong to me as a self aware being.

A trans person would say there is a disconnect between their bodily traits and sense of self.

What's a "non-binary" person who is not intersex and distinctly, physically classifiable as either male or female expressing when they say they do not feel male or female? "Gender" to me in that context is the relation of your physical sex to your identity, so I don't see how it's possible to have something "in between".

The only answers I have ever seen make reference to tastes, personal preferences, things I would regard as personality rather than gender. I for example reject that not being a walking one dimensional 1950s stereotype of your sex somehow amounts to holding a different gender identity, nor do I see how that is even coherent as a concept. You're a young boy who likes baking cupcakes and playing with Barbie dolls? That makes you a boy who likes baking cupcakes and playing with Barbie dolls, that's all. You're a teenage girl who likes cutting your hair short, putting on a hoodie and skateboarding? Great. What's that got to do with anything we'd refer to as your gender?

So that's my "change my view" - explain to me what it means to say your gender identity is fluid, non binary or whatever other neologism has been coined for it and how this is not just either a conflation of gender with personality, or a bandwagon to claim a marginalised identity by people who are entirely ordinary.

EDIT: Huge thank you to everyone who's contributed, it's getting to a point now I can't keep up with or respond to all the answers. I'll keep reading what comes in, but I'm going to have to largely drop out of replying at this point, perhaps save the odd thing which particularly piques my interest.

EDIT 2: Again, thank you everyone. Some of the answers in this thread have been qualitative, useful and given me a better and wider understanding of these gender identities and gender issues. It's very clear that many people have many different conceptions and views of what gender is, how it relates to ourselves as individuals and the constituency of culture and society. While I do still believe there are people out there who co-opt certain labels and identities essentially as a form of attention seeking without any substance to it, it is also clear that to many other people these identities have real, significant meanings which speak to them in a way binary gender doesn't and which have been insightfully explained. To that extent, this post has been successful in "changing my view" and giving me a better understanding of other people's perceptions and experiences.

I want to finish by addressing one last point; there have been a few accusations that the title and body of my post was rude, insulting or disrespectful. I won't apologise for incidentally offending anyone when that wasn't my intention, but I will tell you that wasn't my intention. I do my best day to day in my life to be empathetic, to understand people, to learn, to grow, to challenge myself, my own judgements and perceptions by actively seeking out those of others which may be different and to reserve the right to unapologetically change my mind at any time new information or perspective convinces me I was wrong. That's what I was trying to do here. There's no point approaching that by holding back or being dishonest about what I'm thinking when I come in.
gpt
All genders are contrived and do not hold coherent meaning. Or more precisely, they aren't biologically determined and are in fact socially constructed. A good example of this would be that if you are a man, and you have your genitalia destroyed in some terrible accident, your gender wouldn't suddenly change. Masculinity is about more than just having a penis, although that is a part of it for most cultures. And we can prove this quite easily since the gender binary is actually  more or less a new thing. Dusting off a frequently copy/pasted comment of mine:

Third (and fourth and even fifth genders) are a historical reality all over the world. It's the imposition of the western European strict gender binary which is the new thing.

- The hijra of southeast asia are neither male nor female and are even recognized by some states.

- The mahu of Hawai'i are said to be an intermediate between male and female.

- Similar are the Fa'afafine of Somoa, assigned male at birth but grow up to embrace female characteristics and are identified as neither male nor female.

- The indigenous Zapotec culture in Mexico recognizes three genders, male, female and muxes. 

- The Bugis people of Sulawesi recognize five gender categories: male, female, calalai, calabai, and bissu. Bissu gender is said to combine all aspects of gender in one person and occupied a place of great religious importance in pre-Islamic culture

- Native American cultures had diverse understandings of gender including recognition of "two-spirit" people; some are said to have recognized four genders, one each for every combination of masculine, feminine, male and female

- It's controversial, but the Nigerian scholar Oyèrónkẹ́ Oyèwùmí has argued that the pre-colonial Yoruba had such fluid gender roles and lack of gender stratification as to have essentially no gender system at all. She calls the western colonial imposition of the gender binary "The Invention of Women."

- Some Balkan countries had sworn virgins, women who live as men and never married. They had access to some male-only spaces. Sometimes thought of as a third gender

- Traditional Napoli culture recognized a class of men who live as women, the Femminiello

- Tertullian referred to Christ as a Eunuch, which is a bit strange. Did he mean that Christ was asexual, or something else? At any rate it points to the idea that Eunuch did not always mean "male with mutilated genitals" in the hellenic/late roman world. (Compare Mt. 19:12 "For there are eunuchs, who were born so from their mother's womb: and there are eunuchs, who were made so by men: and there are eunuchs, who have made themselves eunuchs for the kingdom of heaven.")

- In some cultures, Eunuchs clearly occupied a space between male and female. They were prized servants in upper-class middle eastern cultures that practiced seclusion of women - a Eunuch servant could enter the women's area but also function as a man outside of the home. 

- Pottery shards found near Thebes, Egypt and dated to 2,000 BC lists three genders - tai (male), hmt (female), sḫt ("sekhet", the meaning of which we can only speculate.)

- The Vedas and other ancient Sanskrit sources refer to a three natures or genders, pums-prakrti (male-nature), stri-prakrti (female-nature), and tritiya-prakrti (third-nature).

So it's not surprising that some people in our modern culture would find the gender binary to be lacking. Cultures around the world constructed gender in different ways throughout history, there's nothing that strange about it.