The refs know better than to let the crowd get to them, they're the top referees in SA, they have tons of experience and thicker skin then week old custard.
It gets the whole crowd involved, if someone starts with that chant then they will soon gain confidence to start cheering louder when the 6ers score and not just clap like they're at some tennis match.
ALSO
Little kids are born little brats, most of their behaviour comes from home, not one basketball game where the crowd is pumping. If they're stupid enough to try it at a junior game then they will probably be told off by the umpire,the coach of the team and, hopefully, the parents of said child.
NBL games are the only time where it is almost acceptable to voice your disagreement about a call or a players actions against one of your own so just let them do it, it's a hellava lot better than throwing beer bottles at the other team, poor Ponting.