It sounds like the way those people act would be a big problem anywhere, and they probably wouldn’t abide by any new etiquette rules unless the gym was ready to lose money by throwing them out. And even in that case, they could just follow their target to the parking lot which would probably be even more uncomfortable and scary.

People SHOULD be safe from harassment no matter where they are. But I think any place that brings people together is going to eventually create some relationships.