Other people covered the sneakily harmful stuff that’s publicly accepted. I’m still gonna say 4chan. I assume it’s still up. I like to think I grew out of it or that I had a good filter as a teen, but I’m sure it negatively affected my views at least for some time. But half of the evil shit just seemed funny. You can’t tell who is serious and who is trolling because they’re all in the same thread together, feeding equally. So now I’m occasionally reminded of the actual death, mutilation, and harm I saw there.

I don’t know what other boards are similar and active. I don’t know what other modernized sites have joined that niche. I’m aware regular social platforms push harmful conspiracy and fringe theories and create their own spiraling echo chambers. 4chan is still a terrible place.