Here is the thing. That person who is apparently slacking may be doing something wrong. Maybe they're forgetting their dots or certain skills. It's not really a hard thing to give someone tips to better their DPS. If they don't listen, then that is their fault. But just sitting there insulting them won't help at all. It will most likely make the person do worse. I fail to understand why so many people that play this game would rather resort to just blatantly insulting instead of actually trying to help the person.