That was Hexbear's modus operandi when they federated with other instances to "dunk" on people. Seeing as many HB users have .ml accounts to bypass defederation, it's no surprise they keep up that behaviour on .ml. I've seen numerous threads where the vote count suddenly plummets right when a bunch of tankies show up at once to yell at whoever they consider a shitlib. Which is everyone who isn't authoritarian.
I think they can’t stand talking to each other unless it’s circle-jerking over how much "theory" they've read. So, they love getting a chance to scream at an outsider.