Personally
Personally I never even acknowlege fans in the stand. They can scream all they want. I "hear" but I don't "listen". I know that's not the case with many umpires (one at a game this weekend threw out 3 parents during one game).
If it becomes disturbing enough for me, I'll talk to the head coach about it, and usually they are courteous to take care of the situation. If not, then I call on the AD.
JMHO
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