Oh geez, get a grip, at every level of play - middle school, high school and college - players from multiple grades play on the same team.
Did he hit a nerve? I'm guessing little johnny is 12, since you keep posting about 10-12 year olds.
Out of curiosity, how many MadLax kids are 12?
Typical response though, it's always somebody else's fault or "everybody does it" to excuse the MadLax behavior.
I know what I would tell my kid if he said he was good and everyone else was the problem. Maybe your mom should have done the same!