The mechanical keyboard community is unfortunately really toxic. In addition to second hand accounts, I have a friend who’s a newbie in it who I encouraged to talk to people to get her bearings, and there was a basically unanimous chorus of “fuck off, until you have something to offer us you’re just a waste of time”. I think it’s partially because it’s largely gamers, and partially because it’s largely about perceive…
As what switches/layouts/keycaps/etc. folks like are highly subjective and sometimes polarizing, I would often see people espousing opinion as fact. But no one treated me rudely even when I asked dumb questions in their daily discussion/advice threads.
I agree that much of the community consists of essentially bragging to other people about your own keyboards. But I saw even braggarts showing up in newbie threads to try and help other people get into the hobby.
Edit: I will add though, I tend to lurk for a while and gather knowledge before I even ask a newbie question. And I probably fit better with the kind of boys club tech bro culture that you're implying is prevalent (although I can't say I noticed this all too much).