Good Lord. This entire article just reeked of an old curmudgeon who can't accept that times have changed. I've only been to a handful of NBA games and only one at the Garden (2012 NBA Eastern Conference Finals Game 4), but they aren't any different than any other major event that you go to nowadays, i.e. concert, baseball game, etc.
And the only thing I noticed about the crowd was that it was mainly whites and Asians, with Asians being a significant minority of the people there. In fact, I noticed that Asians were pretty common in the Boston area in my visit there.