The "acting white" cultural norm is in part a defense. Which is more hummiliating: to work your ass off in a suburban school to get C's, or to claim trying to succeed is "acting white", cop an attitude and get D's.
Of course we can't talk about this. "That's racist!".
It states in the first sentence of the article that the parents are highly successful and achieving. (Doctors, lawyers, judges, and insurance brokers,) Even with affirmative action, the IQ of the parents is more than adequate.