By numbers alone its probably Hunters,as alot of people play them,and that is true to an extent ( I play one since 2006 ),but all classes have douchebags/noobs/bads or w/e you want to call them. Its especially bad in lowbie dungeons. Started leveling a tank and people (Dps mostly) keep pulling stuff,I just let them tank it and die. They usually get mad and leave,but some of them learn their place.