a douchebag watching a sporting event who either consistently insults the referees' decisions, or, even just once, calls the referee a zebra. These people falsely believe that they are funny or righteous when in reality, everybody find him to be annoying.
referee mcdouchebag: HEY ZEBRA! ARE YOU BLIND? THAT'S A PENALTY!
Alex: I wonder if that guy realizes nobody thinks he's cool. I'd like to kick that guy in the teeth.
Greg: No kidding. He's definitely a referee mcdouchebag.
Someone at any sporting event who always has to call the fouls, say the ref is wrong, or something similar even though nobody really listens to them and they don't have any idea what they are talking about. They think the ref is wrong about everything even though he gets paid to do it.
Soccer Mom-Oh, come on, that was such a foul!
Annoyed Observer-SHUT UP YOU SELF QUALIFIEDREFEREE!!!