Mostly unemployed/idle idiots do this (u wont see a hardworking person do this shit atleast the majority i have seen)...
If ppl see someone they dislike happy they will make all sorts of bs plans to waste their time with fights. For example spreading rumours and instigating everyone in the room to see them negatively? Why u ask - its just for relevance in ppls eyes. Others wont give attention to them if they dont do allegations or fights
At times u will respond , sometimes u wont but ppl wont ever stop targetting. They act like saints in forum trying to preach transience and say we are innocent, but in chat they are just bullies trying to dictate zozo rules by running politics and getting others to do their dirty work and pretend as if they had no hand in it just because they instigated abuse, not do abuse themselves.
In the end all u can do is remove yourself from that shit and move on, dogs will always bark in the end