attack and scream loudly over you

I've found the same thing. And funnily enough just this morning I was watching a years old news thing about government computers being used as sockpuppets way, way back - '05 after Katrina, when people were critical of the government's (lack of) response. So it turns out a favourite tactic of these goons was being extremely verbally insulting.

When you've got no argument to defend, I guess the only thing you can do is attack.