Because these were his comments on Jaden Smith:

"I resent this talentless product of Nepotism sooo much
You can pick any random kid from any art high school here in NYC and they would be way more talented and worthier of the attention than this kid.
****Can we all start by admitting we would not know anything about this kid if Will Smith wasn't his dad?"****

http://board.okayplayer.com/okp.php?az=show_topic&forum=4&topic_id=13206798&mesg_id=13206798&listing_type=search#13206892

Notice there's complete vitriol for the rich Black kid, but none at all for the white one? He also requested that we START with the idea that no one would know Jaden if not for Will. No such request was made for Kylie tho.
Just an observation.