The Bringer of Tea

AFAICT, a lot of these fears seem to be predicated on the assumption that if trans women are allowed to use women's toilets, it will open the floodgates for non-trans men to drag up and start trawling public toilets so they can assault (cis) women. So in the very kindest light, the fear could arguably be less about trans people than about cis men.

it's nice that people are so concerned to protect (cis) women from sexual assault, but there are numerous gaping holes in this idea, some of the most obvious being: women are already sexually assaulted in public toilets from time to time by (cis) men who are obviously not put off by the unwritten rules about women's space; I'm not aware of any evidence so far that gender-neutral toilets offer increased risk of sexual assault; women are already being told, endlessly, about places to avoid if they don't want to be raped, and yet many of them unfortunately still are, so why are public toilets more dangerous than many other places women regularly go? Not to mention, of course, that a high number of assaults are not committed by total strangers.

None of which seems to go anywhere near addressing the cissexism (I think you've got that down already), but it does seem to me that even if the intention is to protect the fragile honour of cis women, this response still fails to be logical. Trans people really are the last people I worry about my safety around, tbh.