A referee is a person who monitors a sporting event to make sure that the rules of the game are observed and obeyed by the participants. However, the refs usually just end up becoming the scapegoats for the players' shortcomings and are abused by players and spectators alike.
Soccer Player: Dude, that referee was a total retard! Nice call, fucktard!
Person: Shut up. How would you like to try to keep a fair game going only to have half of the field curse at you and vandalize your car after the game?