I've seen this in very incel-y contexts, but I can't imagine it being anywhere as pervasive in the context of GitHub. "Everybody hates me even though I'm a really nice guy, but man those class of people are ****" doesn't really have a place to show up.
I've seen the same pattern emerging on instant messaging and forums of various FOSS projects.
The rain of downvotes on my and your comments are very telling, sadly.