After I see this the first time, I tell them that they can have their hands up, but they can't wave them. Usually, this works. I'm sure that I've issued second, and even third warnings.
If I thought a kid, after being warned, was doing it just to show me up or to be a smartass, I would probably call the violation.
If after warnings and violations, a coach was still telling his team to do it, and a short conversation with him doesn't help, then he gets rung up.
The rulebook term for this is "disconcerting the shooter", and the rulebook term for the coach continuing to direct his players to do this even after a conversation is "coach being a jackass."
I also hate it when defenders on the lane shout something, or make a big deal about raising their hands just when the shooter is about to release the ball. Usually they shout something like, "I've got shooter" or "rebound". Certainly these are things that can be said before the release, and it is obvious that they are trying to rattle the shooter, but we almost always let them go. Having said that, I must admit I have, in the past, told a team not to shout when the shooter is ready to release, but only on very rare occasions where the shouting was really disconcerting and intentional.