Now I try to be very aware on how the girls/parents act and put an end to cheers directed at the opposing pitcher/players. We encourage cheering of our players only. If we win I don't want it to be because we cheered so loudly that the pitcher got rattled. I want it to be because we played better.
And the umpire did not eject him because......????Stephanie - I don't know the specifics of the incident you referenced (I think the subject line probably tells it all), but I do think the coaches can help set the tone and expectations of the parents at the beginning of the season on how they should behave during games. Last spring I posted an incident we had with an opposing 8U team's 1B coach who was ranting and raving about an umps judgment call and accused OUR team of being bush league and called us an expletive several times so the whole world could hear it. His team's parents, not knowing the rules, thought that we had done something wrong and the parents verbally turned on us.
So to answer your question, I think coaches have some responsibility for the actions of the parents and to diffuse (or not start) situtions before they get out of control. With that said, if parents are fighting they should be prosecuted to the full extent of the law and banned for life from attending youth sporting events.
Mandatory viewing: The South Park episode called "The Losing Edge". Stan's father, Randy, makes fighting at Stan's baseball games an art form.