I generally don't have TOO much trouble with negative comments from people... most are just curious.
what i hate is people trying to use my guys to their advantage... the other day i was in the barrens on my 5 druids, and there was a hunter following me around. i didn't really notice him for awhile, as it is fairly common to have someone follow me around for a little while watching me kill stuff. Anyways, i was killing those AQ elite guys or whatever.. good XP and drops, etc. but after a minute i noticed the hunter was standing off to the side popping off an instant shot right before my wrath finished casting, so he'd tag it and i'd have aggro... so i'd kill it and he would get xp. i targetted the next mob and started casting, then cancelled the cast about 1/2 sec before it finished-- sure enough the hunter tagged it again, but this time he kept aggro. and these elites were about 5 levels higher than him, so they made short work of him.
come on, dude. i'm smart enough to set up and coordinate 5 characters with one computer, i'm not gonna let you steal my xp...