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"...whites are comfortable with black people, but much more uneasy about certain aspects of black culture, those associated with the so-called black underclass. Being black is OK; acting black, in certain ways, isn't."
The fact that "acting black" is essentially shorthand for "certain aspects of black culture associated with the so-called black underclass" (i.e. crime, violence, black nationalism) more or less sums up "the real meaning of race in America" right there.