When do you get involved in controlling fans

[FMadera]

1) I wouldn't address making noise during serve. There's nothing against it in the rules.

2) When the fans start directing comments specifically to the other team, then I have that stopped. Otherwise, unless they're being abusive, I don't listen to or deal with fans.

Let the fans cheer, even obnoxiously so, as long as they're not hurting anyone, and you ref the game.