The best way to deal with these people is to be very cute and nice to them in response, untill they get so pissed off that they do actually say something bad enough to get a time out from the gm's, then report them

It's my second favourite hobby, after boxing. Get someone nerd raged enough, and if they are stupid, as most of these moaners are, they are going to resort to the racial or gay card, and blizz dont take lightly to either, or so my exp on the eu servers with reporting them has shown.