Some people will complain regardless of any idea of what it is they are complaining about.  Let's see, Mr. Trump said he had learned something and Mr. Blow rails against him.  What exactly is his issue?
Diversity is divisive.  When I grew up we were told we are all Americans and we bring our history and culture and experience to a Melting Pot of American Culture.  Black America has historically not been recognized and Negro  History Week was begun to educate all of America about many of the contributions to our culture.
All these many years later people have no working knowledge of important people in American History and Black history is taught as though anything a black person accomplishes is special due to their oppression. 
Black America has been strong and vibrant regardless of their historical difficulties.  It is time for Black America to look to that history and ask why they aren't achieving those standards today.  Then again, New York Times columnists know no history.