It seems that sports parents have attained the status of rottweilers, to be muzzled and shipped to obedience school. Remember, most coaches are parents, too. Lay off the ref - A justified moan is fine, but excessive razing can hurt your kid's team. Remember that the ref is often a volunteer parent, or even a teenager who's already uptight about tomorrow's math test. Gripe in private - Coaches make mistakes.
Voice concerns away from the kids.
This is not your childhood. Ask how you can help throughout the season. Offer to warm up a few kids on the sideline. For a hero's welcome, bring water or orange slices to the games. With parents like that, everyone wins - especially kids.