It kind of makes you think about the whole point of athletic events, separating contestants by "gender," having records at all, doesn't it? I mean they are running with men's muscles, men's metabolism, men's hormones, all the other things that go into differentiating male athletic performance from female, all the things we say are important such that normally we separate them into two groups. Yet I would not have wanted to say, no, you must compete with the men, even though you feel like women. I think these kinds of discussions are good, because they really make people stop and question their assumptions and dig down into what makes this issue or that issue different, what the point of an activity actually is--is it social, so that what people feel about themselves matters, or something purely physical?
Slight tangent, but I have read some about biological sex differentiation and it's way more complex than most people assume it to be. People in high-level athletic competitions have to do tests, of course, to make sure athletes aren't masquerading to gain an advantage, but between hormone levels, variations on XX vs. XY, and variations in physical characteristics, it is not very easy. If you think about it in terms of reproduction--which is what sex differences are for--anyone who has struggled with infertility is "not normal" in terms of their biological sex, because something isn't working correctly to reproduce. If that was lumped in with more famous things like "hermaphrodites" and XXY (Klinefelter syndrome) I think people would take more notice of how complicated an issue it is. And that's before adding in situations where someone is more or less "normal" for one sex but feels it doesn't match their mental gender. It almost makes you want to stop dividing people up at all.