quasi-related, ever have to clean a women's restroom and be forced to stop, leave and let them use it? No, not because their little kid desperately needed to go, or because they are elderly/incontinent/etc. those are perfectly understandable. I'm talking I just entered and did twenty seconds of work when a 30 something year old woman ignores the closed sign, walks in without knocking, creeps up behind me as I'm cleaning one of the piss, shit, and period blood smeared toilet seats, smiles and says "excuse me, you need to leave because I'm going to use the restroom" then immediately walked into the other stall. I swear I heard the trou drop and I hadn't even made it halfway out. Usually they just command a manager to have you removed so they can use it, but this woman completely upped the ante. I also totally love it when the women who force me out proceed to check their makeup and chat with their friends like teenagers for several minutes, allowing more time for more women to go in. The closed sign is nearly worthless if 70% of the women who arrive at it decide it should not be heeded.
People do stupid shit in the men's room too but 80% of the time the asshole is a woman. If you just assign one of the women on hand to clean the women's restroom, all of this is dealt with.