Jim Henry wroteHome fan pops a popcorn bag just as V shoots. Before ball is put in play I go over to Home coach and say that is an artificial noisemaker and say that can't happen anymore. Coach had no problem and the noise stopped ...
You did the right thing. The only way that you could have handled it a little better would have been to approach the athletic director, site director, or faculty manager, rather than the coach. But in a middle school game, the coach was probably wearing several "hats", and he was probably at the top of the "food chain".