I coach middle school football and U11 girls soccer and assist junior and middle school golf teams .The soccer parents are the worst by far and its not even close. The golf parents helicopter bad and its annoying but ignorable. We get home schoolers in golf who think they are all that because that's all they hear. Cant teach them anything. The regular kids can be tough on them.
This reminds me... I played pop warner football. I'd never be involved in junior football now. For one, I think it's too hard on the body (mine is a living example). But, the parental behavior is horrible. My neighbor/buddy coaches with his son the same age as mine (actually, they were born on the same day!). The stories I hear from him are troubling.