Its fascinating that BOAN raises such says alot about our
lingering difficulties in dealing with race and racism in this culture.
Anyway, first, my biggest problem with putting the onus of Hollywood's
racist, sexist, classist etc treatment of individuals on the South is
that it ignores dominant racist, classist, and sexist ideology of the
larger culture.
Second I would like to add a little bit more plot detail to the
description of BOAN...mainly that the story is told as a sort of
revisionist view of Reconstruction.  In this telling, the Klan must save
the south from the blacks who because of Reconstruction and being voted
into office, are terrorizing whites and particularly white women.  Whites
in blackface portrayed this array of blacks who then were put down by the
heroic Klan.
Again, just my two cents.