You're all perfectly happy with transmen in female changing rooms then? Even if they appear 100% male? And are on testosterone?
Transwomen are women.
AFAB women are women.
Transwomen can't be AFAB women.
AFAB women can't be transwomen.
And 99.9% of the time, all the women in the lady's, and all the men in the men's, just want to get changed, or have a piss. Most trans people would use a cubicle anyway. Genuine trans people are not there to assault you. They're there to use the damn room.
Any evidence of how many assaults happen in changing rooms or toilets by people who are not trans? Men sneaking into the lady's? Pretty sure that's a hell of a lot more common.
I'm not saying women can't be transwomen - I'm saying AFAB women can't be trans any more than trans women are AFAB?
And transwomen maybe don't want to change in a room of men. They are likely to get abused themselves (FAR more likely than you are by them in the lady's) - so by insisting someone who is of very very very tiny risk to you uses the men's room, you're actively putting them in danger and they are likely to get abused. Because men.
Although transmen are welcome to use the ladies, because they're 'not really men,' even if they 100% appear to be, act as a male, and if they used the men's they could be abused because they're really women (although they fit in far more in there) and we have to protect the poor female males... < sarcasm.