It was bad trend when violence, street language, obscene jests and behavior became routine culture, attributed to the particular part of society, so called ghetto. Evil intent here also cannot be excluded, may be with even subconsciously underscoring, nurturing and exploiting our differences. But as New York congressman Charles Randell once mentioned, outgoing President effectively shattered that myth of white supremacy. How easy the problem solved, with Obama's one phrase:

Pull your pants, brothers

In part it was rebellion, but when violence was a solution? There are much more decent ways.
It is no such thing as whoever supremacy. Anymore. The era of cave men is over. For good.