There is no single "black" culture. Blogger Anne Theriault crossed the line when she equated Miley's vulgar gyrations with "black" culture. Culture is reflected through language, dress, music, art, cuisine. Vulgarity is not culture.
It's hard to understand a rationale for the lingering reluctance of mainstream society to truly embrace the work of people of colour as an essential element of its own culture -- not an exception, not as a special category forever locked in a time vault of supposed historical purity.