[crick]

I'm guessing the weekend team is in a competitive league? There are league rules for parent and coach conduct, and often they have a contact person to discuss these matters with.

No parent or coach wants their kid thrown off a team, which can be a result of any official complaint made to the league. Coaches can also lose their job/position to volunteer if an official complaint is made too.

Having said that...

Competitive play, especially in tournaments can get hairy sometimes. Not saying it's right, but it's not an isolated incident and if your son continues to play, he will likely always deal with a form of this. I personally give those parents my best evil eye and mouth "that's MY kid" and then focus on the game.

Coaches are another matter to me, and if I see a coach acting in too hostile of a manner, I would report to the league or inform the ref that they need to address it. And JG has a good point too...address the coach if there are concerns about his team's parents.