This complaint gets old. Every team has the same complaint and all the fans claim they get jobbed by the refs every week.
It is part of the game and whining will not change that.
It's a complaint of those who ...
1.) Are too biased themselves that they can't stomach to see a call go against their favorite team or
2.) Are very immature or unsophisticated and don't really understand the world outside of their on perspective.
Being bias against a particular team is cause for termination. These refs take this game seriously because it is their livelihood. If they were ever discovered favoring one team over another, they would be summarily dismissed as a ref.
Besides, they are also professionals. I am a little league baseball umpire. I was umping a game involving a team with a coach I liked against a team with coaches I disliked. I threatened to throw one of the coaches out of the game. Well, it was the bottom of the last inning and the team with the coaches I disliked had the bases loaded in a tie game. The ball gets hit to the pitch, and he throws it back to the catch right when the runner on third arrives at the base. I call the runner safe.
Of course, one side is happy, the other mad at the call. But I called it as I saw it. I didn't think, "I hate this team so I'm going to call the runner out." It was a split second decision. Besides, my integrity wouldn't allow me to call it any other way, even though, afterwards, I hate that that team won.
When you're involved in refereeing a game, you don't have time for bias. Do I always make the right calls? No. Sometimes, I call strikes balls and balls strikes. But there's no bias involved.
Fans don't realize how difficult it is being a referee. You're absorb in the game, trying to apply the rules. You don't have time to be thinking about, "I'm going to screw this team."