My thoughts is that it’s a simple situation really. If they’re harassing or assaulting people, the women will call the cops or something, simple situation and get the guy arrested. If he’s not doing anything, it’s nothing harmful. Apparently that’s not a solid enough answer. What should I have said?
In my experience what happens is you look at each other confusedly for a moment, wondering who is in the wrong restroom. Then you realise there are no urinals so it’s probably the women’s restroom. Then the man leaves a bit embarrassed. Source: Happened to me at least twice (once the signs were really unclear).