Toxic discourse in large Internet communities predates Reddit, even. It’s been a thing since before there was the web, becoming significantly more likely to find once you get to a critical mass of people.
It’s a good time in the political cycle to find and contribute to niche communities. I almost never come across this kind of thing because that’s where I hang out.
Unfortunately, the shadow of Voat still looms over this conversation. Redditors are wary of platforms that have a perceived radical userbase, and Lemmy as a whole has been painted as far left.