The hostile environment is sometimes present in subtle ways, such as important discussions that occur spontaneously in the men's restroom
Look, if you find your work environment to be hostile then that's entirely your opinion and none of us here can really judge except through what you just wrote.
That said, what you just wrote makes me wonder if I woke up this morning in a parallel universe. Important discussions happening spontaneously in the men's restroom? Seriously?
I have spent my entire life being a man. In this time I can remember exactly zero conversations that took place in the bathroom at work. I have never taken part in one, I have never overheard one happening whilst I've been doing my business there. I do not believe this is some bizarre fluke - there's a strong social convention amongst men that nobody interacts with each other in the restroom. This social convention is only slightly less strong outside the workplace: it's extremely rare for men, even friends, to dawdle or hold a conversation longer than a few sentences in the bathroom. This is one reason why men's bathrooms tend not to have long queues outside them.
In contrast if I had a pound for every time I've been out with a bunch of women and one stood up to say, "I'm going to the bathroom" and suddenly the others all decided they needed to go right at the same time ...... well, I'd be a rich man. The amount of girls-only gossiping that goes in female bathrooms is ridiculous.
If you seriously believe that men are frequently having important business conversations in toilets then I don't know what to say to you. You either work in an extremely weird office, or you live in a country with radically different social norms, or no such conversations are actually happening but you've already decided you're being excluded somehow and can't figure out how or when, so decided to blame potty breaks. In which case you're just paranoid.