I have a feeling this thread is going to explode!
Thanks to HSBBW, as a high school parent I think I've evolved from pseudo-loudmouth to the guy who sits quietly and digests. Considering that it's not my nature to be passive I will say it has been a chore, but I do it for the sake of my kid. Now that he's in college, and there is more rah-rah and talking.. man, I'm tempted!
As for loud-mouth parents, I was the assistant coach of a middle school team and Bum, Jr. was on the mound. He gave up a fly ball to left field and the guy muffs it. I innocently called out to the mound and told Bum, Jr. "Hey that's alright, not your fault.."
You guessed it. Mom on the sidelines starts going bananas, cussing, creating a scene. After the game, the head coach approached me and told me the lady laid into him and said she was filing a formal protest with the athletic director about my conduct, and the coach said I would have to visit the school office and explain.
It was the last game of the season. I politely told the coach, "Tell the athletic director I resign."