[CYO Butch]

If hitting the walls is all he is doing, it is childish and a bad example for his players. In that case, follow LarryS's advice option 1) and help you kids learn that there are better ways to deal with frustration. If he is doing more than that, there may be a serious problem. You should talk to other parents and find out their perspectives. If they are in agreement that there are potentially serious issues, have one of you (probably you) talk to the coach about your collective concerns. Do not start by ganging up on him - that will only make him more defensive and he won't listen. If that doesn't work, then collectively communicate with league officials. If you personnally have already done so (as implied by your post), do not be the spokesperson this time. The superintendant will think it is something personal or that you are a loose cannon.

As a coach, I can tell you that we all get frustrated, and that frustration may turn us into "howler monkeys". But that frustration needs to be controlled. It takes some longer than others, and some never learn. This guy obviously hasn't learned that your sons' age groups will never be able to perform up to his expectations and he most lower them appropriately. He may be able to figure it out, but he may just not belong coaching youngsters. Just as the refs call us "howler monkeys", we call loud mouthed parents "parents from h*ll". You seem to have hit on somewhat of a cross-breed between the two.