Agreed. In the end, it's all ingroups and outgroups, just on a
  grander scale. You see the same in sports, businesses, Community
  associations, PTA, in families, in schools, among anything where
  there is a "cause" - all the isms - activism, environmentalism -
  pick any -ism - , you see it among gamers... sometimes the bond
  is love of something in common, sometimes the bond is hate of
  somethiing in common -- and its interesting to watch. Makes
  sociology and group psychology interesting when you can see what
  lies beneath the behaviors :) "