I work in gyms (I'm a personal trainer), I'm also a gay man for whatever context that provides, if any.
99% of men are silent in changing rooms. It's like a Trappist monastery in there most of the time. Straight men in particular are not chatty, and are even less so when naked. Most of them won't even make eye-contact, let alone speak.
The issues, as I've observed them, seem to crop up when you've got groups of men who all know each other. Team coaches for sports, stag dos, corporate away-days, that kind of thing. It is quite often initiated by one berk, and then the others join in. As a gay man I've been on the receiving end of this as well.
Schools are still bad, I think. Teenage boys, especially straight teenage boys, can be utterly vicious about pretty much anyone. Football team supporter culture is another nasty pit of base and overtly tribalistic male behaviour.
However, in a broader context I would observe that the overt 'locker room talk' (the Trump sort of thing) is less common now than it was 10 years ago. Although I think there are different channels (mainly online) for dickheads to get their misogyny on.
At a previous gym I worked we had issues with a group of blokes who started to monopolise the men's jacuzzi and talk a lot of crap about 'birds' and 'tits'. Dear readers, they were not ornithologists. (Or indeed 1970s comic strip characters.)
But the interesting thing was, several people complained, and they all had their memberships cancelled. Bear in mind this was a men's jacuzzi so it wasn't women overhearing and complaining; it was other men who were hearing this crap and deciding it wasn't on.
I don't know what the answer to this is. I don't know that there is one. Not a simple one, anyway. Some posters in FWR will talk about 'men as a class' getting their act together. I get why they do this, but I don't know how realistic or practical it is. We're not all on a single massive WhatsApp group.