If someone decides that contrary to their actual ancestry, they decide to identify as a black person, am I being a jerk by not recognizing them as black?
This is where it gets super slippery, and it's the heart of the arguments here.
Looked at one way, does the claimant actually believe that they are a black person trapped in a white person's body? Can't say I've ever heard that claim made soberly. Yet that's exactly what a trans person claims. It's literally how they are wired, and they have no more choice in the matter than you or I have in feeling like we are guys.
The flip side is that reality is reality, and it's weird to have to deny reality to assuage someone else's version. That's a double edged power play, either they get to dictate reality, or you get to...well, be on the side of actual reality, which is hard for a skeptic to criticize.
But a trans person might bring up the That Thread argument: what they feel like is really the reality, and objective facts be damned. If so, then if I see myself as an irresistible hottie, others should comply with that. Doesn't seem reasonable though, does it?
I guess the name of the game is to accept and support trans people, and at the same time say to the trans person "yo, you get that your unusual situation is going to result in misapplied pronouns once in a while, yeah? I mean, woman on the inside and man on the outside...it's gonna happen."