I do try to attack the message, not the messenger, but it can blend in. Especially if they get too attached to an idea.
Eh, people who know me, I say the same sarcastic things out loud. Heck, I think I'm less prone to filter in RL. Here, I try for an edit check... Of course, the concept of physical fights resulting from some comment on the internet is silly to me, but too bad there are people that think violence is the way to win arguments.
Also, it's the run-on sentences that make people's eyes glaze over reading the OP posts and you wind up not sure if you already read the sentence. At least for me.