I have no problem with fans cheering loudly if they are in the stands. At a recent away game, the fans (all boys) were standing along the sidelines, just outside of the out of bounds line for basketball games. They obstructed the view for people in the stands, and our girls said after that they were making offensive comments to them personally, like saying, "hey 14, nice boobs" or "17 is a lesbian". That was across the line to me, but, I didn't actually hear the offensive comments, as I was in the bleachers. They were down on the floor facing the game, only steps away. I think the volleyball coach should have put a stop to it. The "let boys be boys' attitude is why boys do these things and get away with it!
Their tactics didn't work, won won!