It has always concerned me from a young age why we have to have different rest rooms. Once I started travelling and spent time at a few campsites in France I noticed that despite having M & F areas and showers most of the local women didn't differentiate and often used the designated Men's areas. I reckon that these places only had separate areas to cater for those nationalities with the hang-ups about sex issues.
Once I started moving around Asia and places like Thailand and Philippines where Trans were more prevalent and accepted it didn't seem to matter at all any more. I believe the problem is exacerbated now by the immigration from Islamic countries who go even further into separation in all manner of changing areas at Swimming Pools, Sports Halls, etc.
It is perfectly natural, we are all different so get with it. The only reason we get predators is because we have those with hang-ups that are locked into a closed mindset. Get real, what better place to enjoy a bit of banter and chat with someone different, than while having a piss up the urinal. I remember standing at the urinal in a bar in Manila when a gorgeous trans next to me hoisted her minidress up and pulled her panties to one side and got a bigger dick than mine out , while we joked about life in general. A terrifically funny experience for me and perfectly harmless.