I've come to the conclusion that fans & coaches actually don't know the rules of the game.
As an umpire I have to take a test every year before the start of the season, and I have to pass it @ 80%, based on our umpire association, which I believe it way too low. We should pass it at 90%, with those that passed with scores over 95% getting the better games.
As an umpire, when I hear the fans screaming about a call, I literally laugh, because I know those fans don't actually know the rules.
If I'm being harassed by a fan throughout the game, at the end of the game, I walk up to the fan and just say, "You should be an umpire, because you're really good at it. Our association is always looking for umpires. We would even train you. You're making better calls than me and you're 60 feet away." Obviously dripping with sarcasm, most walk away, but some would still discuss the game with me before I tell them the actual rule.
David Wells, a pitcher that threw a Perfect Game with the Yankees, is a manager for a local high school team. When I did a game for his team, at the end of the game, he walked up to me and said to me, "You are the best umpire we've had all season." I replied, "Can you please tell that to our Umpire Association Assignor?"
I had a catcher, that received a baseball scholarship to Northwestern, after the game, tell me "You have the best strike zone." Again, I say, "Please tell that to our Umpire Association Assignor?"
Again I really enjoy being behind the plate.