Does black now mean anyone other than white people then? That's like "men" and "not-men"! 
Hopefully the "trans race" issue is where this will all start to come unstuck and the public will hit peak trans in droves. Have tried to understand why "transgender" is apparently fine whilst "transracial" isn't, but all the arguments given seem to equally apply to both! Actually "transracial" seems to make slightly more sense tbh.
I'm, er... trans-national? Or something. Oh yes. Am a different nationality inside. Must be. Whenever I meet people of this particular nationality I get on with them, feel an affinity with them. I feel drawn to the language and love hearing it spoken (haven't actually learnt it but oooh I feel it's my language somehow). I actually get mistaken for being this nationality when abroad - including by people from the country in question who approach me speaking in their native tongue. Crucially, aspects of my pesonality and preferences actually resemble their national stereotype.
The above is all true. Yet I have never been to this country, my family are not from there, I have no idea what it's like to grow up there, and my passport says "British". So being trans-nationality is bollox, not based on the way nationality is actually defined and allocated. And yet, where an identity catergory is allocated based on actual biological markers, actual fact, rather than feeling or coincidence (eg. birthplace), we are supposed to cast all this aside and agree people can "transition" based on stereotypes!
Had a great conversation with DB (22) recently. He said "What I don't understand is, if we've agreed that a load of stuff is untrue sexist sterotyping, what does someone mean by 'feeling like a woman'?" I think he thought I'd be able to answer that question. Rather satisfying moment hearing him hit peak trans over the phone.