Anecdotally, I’ve also been there for 10 years and have seen that. Beyond e.g. GamerGate one really annoying group used to spam city subreddits with stories about black people committing crimes (not even in that city) and the usual “some people are just more criminal” racism talk. They’d get a few downvotes but also had their buddies upvote them enough to show why that’s not an effective solution.