Well *thinks* I'm gonna take a page out of the last time I ran. Stopping toxicity in of itself is partially impossible, without the user willingly agreeing to stop being toxic.
80 percent of the time, trolls and your general i hate the community toxic users, just want the fame and attention. If you ignore them, they won't get what they want, and should sub sequently leave or just stop annoying us. Don't retaliate against em.
The other 20 percent should be fixed the exact same, except with a few additions:
First, ignore them, problem should start to fix itself.
Second, if the first doesn't work then don't retaliate, I know we all love them memes on Rareinsults, but that's just gonna fuel the fire, and instead, try to negotiate a compromise between both parties, (or just block em).
If the First and Second don't work and/or it gets too bad and they start throwing death threats, I'd suggest to bring that issue to the mods. (Dont go run to them every single time someone says something you don't like, only when it gets real bad) OR, once again... ignore them, if you followed the second step, and tried to create a compromise, but failed. Just ignore them, they are a lost cause and aren't worth wasting time fighting.