Some one asked me what to do when your child's coach is a bully. My oldest daughter plays on a competitive soccer team. She has come home numerous times upset that her trainer (not her coach) yells at her constantly during practice. Out on the field on game day, you can hear abusive coaches yelling at their players. Unfortunately, some of them even cuss at their players.
There are a couple of things you can do. First, you can talk to the coach or trainer about their inappropriate and aggressive behavior. Coaches can be very competitive and they may not even realize how badly they are behaving and what a poor example they are setting for the children they coach. If that does not work, contact your league. Your league, no matter what the sport, will not tolerate such behavior from trainers and coaches.
If all else fails and this is a real issue for you and your child, it is up to you as the parent to say enough is enough. Nobody bullies my kid. Be prepared to pull your child off the team. He or she may miss out on a part of the season, but the new season is just around the corner. There are lots of other sports going on as well. Bottom line, you have to do what is best for your child. Good luck!