I have coached multiple sports at multiple ages for multiple years and it never fails that at least one apple has to be bad every year. Whether it be from my team or the other. If the problem is from the other team....walk away....you don't have to deal with them enough to confront them. (Assuming their not threatening you or your child's safety.) If from yours, it gets tricky because they go to school together, etc... I agree with TripleAMom that confrontation is the last thing we want the kids to see but you can't let a "problem person" go unaddressed. It is sure to escalate at some point if no one acts. As I said, I am a coach...it is my responsibility to handle these situations. If you have a continuous problem then the coach is not doing their job. I know some coaches who may read this are cursing me right now but the fact is... Voluntary or not, we signed up for this and must except ALL that comes with it. We coaches have more ways to resolve the situation than the parents and with less likelihood of a bad scenario. I personally pulled a "problem" aside and told them...."Think, believe, and complain to whomever you want off the field. If you keep up as you have, you leave me no choice but to remove your son from the team." I was calm, collected, and firm...no more problems....at least at the field. A coach does have disciplinary authority and should know the protocol Hold your coach accountable. (assuming he's not the problem) If he is, revert to TripleAMom's director suggestion. If the problem runs up the ladder...not much a parent can do in public youth sports but find a new league. Problem...this plague is widespread and sad. Could go on all day...sorry.