Mind leach above made an extremely good point so I’m just gonna copy paste it.
Trolls escalate. They keep pushing until they get smacked down, then cry and scream and pretend they’ve been proven right. Being ignored doesn’t just embolden them, it bores them, and tells them they need to get worse to get attention. No matter what happens - no matter what anyone says to them - they get to use it in their stupid little word game.
The nature of bad faith is that there is no right answer.
You have to simply get rid of it, and the sooner, the better.