Everything about it falls apart as soon as it’s put to any test of logic.
if anyone can instantly and magically be the opposite sex just by saying so, and other people are meant to respect that and go along with it, sex classes have no meaning at all. It can’t be defined as “whatever I say” any more than you can sort foxes from chickens by sticking random labels on them. It just obliterates the original meaning of the words to the point where’ll you’ll just need new words.
Sex is supposed to not exist and be a social construct, yet oddly enough trans people seem to know which opposite-sex hormones they want to take to try to change the sex of their bodies, and which bits to cut off and emulate. Being “non-binary” means rejecting identifying with either of two sexes. Yet we’re told if we think there are two sexes we didn’t progress beyond primary school biology.
It’s ok for TW to be in women’s sports and changing rooms because sport is unfair anyway, or women can get attacked in a toilet anyway. Women don’t have a physical disadvantage. Women are more violent than men and so on. So why are there women’s categories in the first place and why do males want to be in them?
Self-id is essential because everyone is who they say they are. So that means a male being in a women’s space is not safe, as whoever’s he’s afraid of can also self-Id into that space.
apparently brain scans can prove you can have an opposite sexed brain. But we don’t want brain scans as a test to check who is really trans to avoid people making a mistake or to stop predators exploiting self-Id. Oh no that would be gatekeeing!
sex is a “spectrum” which somehow means you can magically announce yourself to be somewhere on the spectrum that you are not and can never be. But this doesn’t apply to ethnicity, height, disability or age, which are all actually spectrums.
and on and on….