Reverse racism is a myth.
You shouldn't be generalizing on race if you want me to believe that.
Honest question: does it have to be directed by "a privileged ethnic group" or is it valid if it is by any general group or even a single, privileged person?
That said, I'm no academic, but I remember reading something about this a few years ago, in the case of a woman in France accused of anti-white racism.