Real talk, in 2017 the library I worked at did a renovation and one of the things we added was a single-gender restroom at the back of the children's area. The idea was so that dads could take kids to the bathroom without it being weird, but our director overheard my coworker and I talking one day about how it'd be handy for trans folk & how we should put it on the trans friendly bathroom map when it was open.
And the director said, no no, it's for parents with kids.
So my friend and I said, wait, are we supposed to stop people if they're going in there without kids?
And she said no, they don't have to have a kid with them, maybe they have a kid who's in the children's area and they don't want to go far away.
Oh okay, so we should ask them if they're here with a kid?
And at this point the director was starting to get annoyed. No, you don't have to make people fill out a checklist before they go to the bathroom. We just expect that adults won't be hanging out in the kid's section without kids
Okay, I (an adult services librarian) said, so should I offer to go get books for them if they want a children's book and they don't have a kid with them?
And should I (my friend the children's librarian) ask adults without kids to leave the children's section? How long should they get to browse before we ask them to leave?
And the director said "I'm not asking you to police people's bathroom usage or keep all adults out of the children's section, just let me know if someone is being weird"
And the visibly trans woman who was a library regular (and who knows how many other trans and genderqueer people) used the single restroom in the back of the children's section and it was never a thing again (at least not while I was there)
It's very easy for cis people to make stupid rules but it's even easier to make them backtrack by pointing out exactly what kinds of conversations they'll have to have with strangers in order to enforce those rules. This wasn't even a coordinated plan from my friend and me; this was just weaponized autism. We wanted to know what kind of awkward conversations we were being asked to have. (The director probably took the final step that neither of us did, that she'd already made it clear that if we found someone looking at porn on a library computer or carrying a gun on library property, we didn't have to confront them, we could always get her, and there was no way she could get out of bathroom police duty if she made it an actual rule )