The point we're trying to make is that we have tried, he's just being too thick skulled to listen to us. He either ignores what advice we give him or (as Kill All stated) takes it as an insult and tries to make a comeback.
Destroyer made a good brown townogy earlier, too. If someone walks in a supermarket and starts pulling stupid stuff and insulting people, are you going to try to teach them not to do that? No, you're going to kick them out because they're being a pain in the ass. That goes for here, too: if someone starts tossing insults (even if he/she may be new), chances are you aren't going to spend a lot of time trying to straighten them out.