Meant to mention this before. Using the intersex term for transgender people is not only wrong, but only confuses people into thinking they are the same thing. Not that I think that happens often anymore. I could be wrong.
As for the differences in the brain, even if that's the case, I don't understand why they can't just be a feminine male or masculine female rather than changing their gender altogether. That said, I'm not transgender. While there might be attention seekers, I'm not blind to the fact that there are people that truly feel discomfort with their own body. Again, that said, I do think they are too many "gender terms" that are basically saying the same thing or unnecessary, and that's before the joke genders come in.
Honestly, most people probably don't even care about what others identify as until it comes to dating and sex specific areas. While I do think it is fair to have more gender specific and unisex places, I don't think it is fair to get rid of places for people that do want the typical specific sex places.