The logic is plain and simple. Flag how you please. Please may disagree but on you go.
I was commenting to provide a counter opinion on @canadian-coconut 's and your implication that there's a way things are done around here. I also wanted to call her up on a threat. But just because I haven't commented on @berniesander 's posts to admonish him doesn't mean I think it's okay for him to carry on as he does.
I think flags should be used however you want. And there's no way for someone else to stop you except to try to persuade you to change your mind by opening a dialogue (which in my experience is how things mostly shake out) or by flagging them into reconsidering.
And it already is a huge mess, but then so is every social network with any amount of freedom.