It's a vague connection. I think it goes through Batman's
  parents: Via wikipedia:

  "A gifted surgeon and philanthropist, Dr. Thomas Wayne is the
  father of Bruce Wayne and the husband of Martha Wayne. He is the
  inheritor of the Wayne family fortune after Patrick Wayne, which
  was built through industry and real estate by previous
  generations."

  The father was a surgeon, a field traditionally dominated by
  white males. Philanthropy as well

  Industry and real estate and multigenerational fortune are
  typically in the "white privilege" domain, as it having his
  parents shot and then being taken care of, as opposed to being
  sent to foster care.

  I suppose the implication is there that, if batman's parents
  were black, EVEN WITH the family fortune as it is, it's possible
  that the Wayne company would have just sent little Bruce off to
  foster care and taken the family fortune for themselves, I
  dunno. I haven't really analyzed it; just at first glance. Also,
  look at his lifestyle.
  He's considered a hero.
  If he was black, he'd be a criminal, even if his intentions were
  good.

  I'm not saying these things are TRUE - I mean, this is a
  fictional character here, so it's just adding fiction on top of
  fiction really tongue emoticon