Yes, mostly from twitter, honestly. I've had to block some nice and generally good people with great art just because they liked to stir the pot, and then it would make everyone else on art twitter rant about the same arguments over and over again--for like weeks. It made me so tired I just had to block.
Even if I absolutely agree with their opinion. I just gotta block. Some people are just really bad about the way they share it, and get very aggressive and send out literal mobs of fans after small accounts...it's not good networking.
As far as the forums go...I don't sub that often to begin with, honestly. So generally the people who cause chaos tend to get banned before I give their work the first glance.