Stacy,
To quote a very popular president, "I feel your pain." I think you are doing the right thing according to the scenario you posted.
Hopefully, a lesson will be learned by all. Any "real" soccer player on your team will understand your decision.
What a wonder is coaching, huh? In this passion, success and failure are so often the result of the whims and vagaries of teenagers.
Focus on the kids who do "get it," rather than this one incident. That may help.
Keep kickin'...
