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