If someone who appears to be male goes into a female toilet, women are told to assume they are transgender.
Until they reveal themselves as a sex pest at which point we are told to assume they are male.
Absolutely this!
One of the things that still leaves me baffled (and a little amused) about the toilets and changing rooms is how fast people have become okay with males in them. When DS1 was tiny there was an aibu on here where a mum was pissed off because she'd been swimming with her DD and DS and had taken them both into the women's to get changed, her DS was about 8 and some of the other women complained and said he should be in the men's. She was told almost unanimously that swbu and that it was ludicrous to take an 8yo boy into the women's changing room, it wasn't fair on the women and especially any young girls, they'd have made her remove him immediately, what about their daughters, it was disgraceful and pathetic to suggest he might be at risk in the men's, she was paranoid, it's awful to suggest men are dangerous etc etc.
This led to "what age is it okay for boys to be in with the women until?" and I think the answer was "about 6 or 7".
6/7 years later and most of mumsnet seems to be fine with adult men in the changing rooms with their daughters, and believes that those adult men would be at risk in the men's.
WTF happened?