Mentors who, rather than give you a chance, attempt to kick you for making a mistake. Like, you're a mentor, f- off if you don't want to do your job.
Also, probably "ranged who stand up the bosses rump" .. Like, you're ranged, why are you in melee range with me and the other non-ranged DPS? I've never played another MMO where the ranged don't use their distance based abilities to their advantage.