I think it's just one of those like, hostile to anything not seen as "default" kinda things, right? there are two sexes, male, and political, two races, white, and political, two orientations, straight and political, kinda deal.
I think that's probably the case for some people in some communities. More broadly? i doubt it though, i think.
Like i've followed linux communities semi regularly, and every so often you'll get mentions of queer posting in the comments, and you'll get queerphobic shit in response, which given that the linux community is mostly older people, who are nerds, that generally tracks with what you expect, but there are also always people who just aren't pieces of shit also, so idk how much of it is demographic concat, or something else entirely.