By baiting, I mean posting deliberate dog whistles, often as crude proxies of what they fear and hate, and set off what is sometimes hours of chud barking in that area, whether it's a game's lobby chat or Discord or whatever.
Examples I've seen include old and exhausting shit like "did you just assume my gender" and "check your privilege, shitlord" 4chan greentext-tier staleness, but sometimes they can get slightly more cunning and insidious, such as portraying themselves as farcical LGBTQIA+ people then announcing an intent to do (conspiracies/crimes that chuds accuse LGBTQIA+ people of here) and keep up the whistling until every chud is barking across the site.
I do play some online games and calling out bait sometimes works, but it's still exhausting when a cooperative game shuts down because some chud starts a hate rally and effectively shuts down the game's cohesion for a while. 
Realistically though in in-game lobbies and stuff where you can't post memes or whatever, I usually just say something like "you should talk less" or "you talk too much" and leave it at that, don't respond to anything else they say. Admonish them and disengage so they have nothing to sit with but flat, straightforward, stern disapproval.
Don't give them anything to argue with, or try to stir up more shit. Just tell them to shut the fuck up in a less basic and dismissible manner.
Yeah and I usually block them unless I want to watch them flip out, or sometimes clown on them