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Not always recommended, but:
At one frosh game early in my career, I had nearly the same situation. I waited until one egregious comment (the fan wanted 3-seconds on a multiple try / rebound / try ... "play" with all 10 players in the lane), stopped the game when one team gained control, pointed to the fan and said, "You're gone" (giving my best baseball ejection mechanic). After he left, I explained the rule to the rest of the parents. There were some "ooh -- I didn't know that" comments and the rest of the game went smoothly.
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