What makes it toxic, how they treat each other or how they spread to other communities?
I'd say toxicity is predicated on the level of deception and backstabbing among the members to eachother as well as the presence of pedophilia, scamming, predatory behavior, ect. So the most toxic communities in my opinions are smaller because they allow more targeted attacks... but they can exist among larger sites (like subcommunities within youtube)
I've never seen another site where multiple libellous members will invent criminal allegations against one or a few members who have done nothing, and fill pages and pages of the forum with said allegations.
That is some pretty foul and disrespectful behaviour.
In certain rl circles, the sort of false criminal allegations that these ppl repeat constantly will get w/e rumour mongering shitbag spreading them killed.
Hell yes. You've heard "snitches get stitches," well ppl who LIE when they snitch die like a bitch.
I'm surprised that a bunch of ppl claiming to be such badasses don't grasp that.