Actually I agree with Stern and the league on this one (never thought I'd say that). What Eddie did was way over the top. Not only that, but he kept doing it on the sideline during the timeout that followed.
Frankly, I don't want to see kids immitating a gesture that they may not even get. The NBA has tried to make their games more family friendly and if this is your business model, you do not need your players doing a pantomime of "Hey, I have a big sack...look!"