I know this is an old thread, but I'll chime in.
From what I've read, and seen, it seems that what happens is just the opposite. Often times, past and present NBA superstars get called for soft or rackytack fouls by refs.
I used to watch the Knicks often in the 1980s and 1990s when Patrick Ewing was in his prime. It always seemed like the refs were calling fouls on Ewing for the lightest touches.
It continued in the last ten years on the good Lakers teams with Kobe Bryant and Shaq O'Neal. Often times, when watching Laker games, it seemed like Shaq and Kobe were called for the most insignificant fouls, when others could get away with much harder fouls. In fact, in Phil Jackson's book, The Last Season, his chronicle of the 2003-2004 Lakers season, Jackson stated that he got fined, twice, for publicly complaining that the refs were calling unfair fouls on Shaq.
While it might be true that some superstars get away with things, the instances I cited are examples of how this isnt always the case.
Mitch