Not a habit, as Brad says, but 2 or 3 times in 5 years of middle school ball might be okay. You might also try, as play goes on "Coach, I"ll explain later" and then go back to focusing on the game. He may very well forget all about it, but if he doesn't, he'll probably learn something useful. It's a chance to sort of screen out the yell'er from the serious learn'er.
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