system
Given the following post, respond as if you're commenting on Reddit:
human
CMV: Transgender individuals should compete with their biological gender

BIG EDIT: I goofed-- biological gender isn't a thing, I meant biological SEX. Sorry for the miss. 

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To start off, I'm cis, but very pro-transgender rights and I have a lot of transgender friends. Thats one of the reasons that I'm bringing this up-- despite my support, the way I see it, transgender individuals should compete with the sex they were assigned at birth at least from the collegiate level, and I worry that this belief may be based in some inherent bias which I would hope to extinguish for the sake of my friends.

The reason I justify this belief is the fact that we separate the sexes for sports (theoretically) based upon the biological advantage that men have over women. If we are basing sport segregation off of biological make-up of the players, then it makes sense to me that transgender individuals compete with the team they are biologically a part of. I understand that it may be restricting for many people who are transgender and want to compete in sports, but may not feel comfortable competing with a gender they don't identify as, but I also feel that for many female athletes, it may put them at a disadvantage being required to compete with individuals that have a strong biological advantage and presenting this disadvantage goes against the spirit of segregating sports by sex in the first place.

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I suppose the main thing that could change my view is that the biological advantage is not that strong or that those that transition lose their biological advantage, but I'm open to hearing other ideas.

Also disclaimer, I don't know if I'm entirely pro full sex segregation in general. I would honestly prefer something more like what the international chess leagues do, which is allow for female competitive spaces but also provide for both sexes to compete together.
gpt
The main thing that gives men an advantage is testosterone, That means that after a while on HRT trans people either gain that advantage (for trans men) or lose it (for trans women). Most of the advantages that trans people keep are their bone structures, which are not that different, only give a very slight advantage if the give one at all and most importantly cis-people can have these advantages as well, just from how normal variation in bodies works.

Additionally trans people are allowed to compete in the category for their gender at the olympic games after 2 years of HRT. They have been allowed to do that for about 20 years. If trans women would have such a big advantage over cis women then were are all the super successful trans athletes. There are a couple(as would be expected just by random chance) and these cases are then spread so far by anti-trans-activists that it seems like there are a lot.