Don't play seriously. I'm the worst DPS on my server and am bathing in them. But I make people smile with jokes and being friendly. I know I lag, so I say so. I know I don't remember a mechanic, so I warn people. There is no way I'll go into an instance without saying "hey I'm doing such and such irl so I may need to emergency brb" and people understand. Communicate in a manner people can relate to and have a non hostile environment.