I only had a few idiot parents in all the years I coached HS football. Probably because F'ball has a lot of tough kids from single parent families and they are just too busy to be around much. One parent did confront me after a game and I offered him the medical kit and ball bag to carry to the bus if he really wanted to help.
I did have a parent that was a big shot school district admin guy dreaming of his kids Div 1 career. Any other parent would have been easy but this guy had a direct line to the Principal and AD and I guess he intimidated them. He never did talk to me directly. Kid was a pretty good player but if dad really wanted him to get a scholarship it wouldn't be at a AA school known for academics. The good/bad thing is this was a great kid, I loved that kid. Smart, unselfish, respectful, tough; everything a coach would want. I think he was my MVP.