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human
Many people who would never date a transgender person feel that way because of transphobia. CMV

I want to preface by saying that there are many reasons why a person wouldn't want to date a trans that probably don't stem from transphobia:

-They have sexual characteristics you aren't attracted to (eg MtF has a penis, FtM has a vagina)

-They can't have kids (Though its worth noting that MtFs can save sperm)

-You don't find an individual trans person attractive (If you don't find someone attractive, then you're not prejudice for not dating them, however I do think that if you say you won't date trans people because you don't find trans people attractive then there is prejudice there, as you're judging the appearances of all trans people)

-They have a personality or characteristics that you don't like

There are a few more I'm sure but those are the main ones.

I've encountered many people who both would and would not date a transgender person. Take this situation. Lets say there is a beautiful, absolutely gorgeous post-op (meaning shes had operations and hormones to change her physical appearance to that of her preferred gender) girl. Its entirely possible that a trans girl can be absolutely gorgeous, and on top of that look 100% female with her clothes on or off. Now I've met many men who would never date this girl. I could show them a picture of said girl and they would say "wow nice she is absolutely sexy, 10/10 would tap". As soon as I say she is transgender, they would say that there is no way they would date or hook up with her. This is the part that I find to be transphobic, and this is no way an unusual response. 

So of course I follow up by asking why they would not date her. They say, because she used to be a guy before. I'll ask why that makes a difference and one common response is that they're not attracted to guys. But she isn't a guy. She is about as much a guy as a piece of paper is a tree. Would you not date a women who used to be utterly unattractive and unappealing? No that probably wouldn't bother you at all as long as she is attractive now and here forward. For all intents and purposes, unless you're giving her surgery you would never even figure out she was ever physically a guy on your own. It's simply completely irrelevant that she is trans. I'd say that the person's discomfort with trans people is  the actual main reason why they would dismiss her completely. Thats not enitrely unexpected though as society is very transphobic and people often make fun of those who date transgender people.

Now one thing that many people argue against me is that "How could I be transphobic for not wanting to be with someone, I mean, I'm simply not attracted to her because I found out she is trans.If I'm not attracted to her then how is that transphobia, didn't you just say that attraction isn't representative of prejudice?" But the reality of the situation is that they are attracted to her, they are just uncomfortable with her. That discomfort is transphobia. If that person was fully comfortable with trans people as some people are, I bet they would be perfectly fine with dating them. I've never met a person who I've felt to be open and understanding about transgender people who would also have a problem with dating a post-op transgender person for reasons other than the ones I listed at the beginning.

I've also met people who view this situation as a matter of sexual orientation. i.e. A straight guy may say that his sexual orientation is just cis girls, or a bi person might say that they are only attracted to cis people and so they wouldn't date a trans person. I think the biggest flaw with this is that sexual orientation isn't representative of who you would date. Sexual orientation is representative of who you're attracted to. If you can completely within reason fall in love with a transgender person and spend your whole life with them and never know they're trans, then how can you say that you aren't attracted to them? Even in a situation where you're dating someone for a year and then find out they're trans, its not like your sexual orientation just magically kicked in and made you unattracted to them at that point. If you were in love with them for a year and then suddenly stopped based on a fact about their past, then it's not a matter of sexual orientation.  And I'd bet that if this person was completely not transphobic, he would recognize that it changes absolutely nothing about the relationship and his only beef would be that she kept something so significant about herself from him for so long. (that being said, I'd like to point out that transgender people have a lot of reason to keep the fact that they're trans from people, even people they're dating. Thats a very tricky situation in and of itself though that I'm not going to delve into though)

And one final thing I'd like to make clear, I don't think a person is transphobic for not wanting to date transgender people. I'm saying that in many cases the reason a person wouldn't date a transgender person is transphobic.
gpt
I think the crux of the matter is that most people don't consider sex change to be really possible. A man will always be a man, just a man with other hormones and a surgically created pussy.

Plus whenever you look at a trans-person, if you know they are a trans-person, you can't avoid seeing who they used to be in the back of your mind. No matter how gorgeous they look now it will be disturbing to have in your mind the idea that this person used to be a man whom you would find it extremely gross to have sex with and in that pretty female face you can kind of make out the face of a man through a small amount of imagination.