Even when dad is screaming from behind the backstop at a little league game, junior probably doesn't hear him because he is concentrating on the pitcher. If dad is being heard, its likely a distraction. Give him a chance to play. You can talk about the game at home if your child wants to discuss it. A player needs to take ownership of her game and be responsible for the outcome of her actions.
Young kids like to have a little distance from their parents.
It may be one of the appeals of team sports. Teenagers, especially, like it when their parents are not seen and not heard. When a parent makes a spectacle of himself at a game, the child is embarrassed. He learns that the mistake wasn't his fault. It was the result of poor officiating.