What I think is happening is that pre-existing racial prejudice, buried and suppressed by pressure to be politically correct, is being exposed. I suspect people of color have sensed the hidden prejudice all along. Now  there is the unquestionable proof in the actions and words of those without fully developed frontal lobes...teenagers...who lack the benefit of considering consequences and the benefit of empathy that racial prejudice is still alive and well in our society.
This may be a wu li moment in the sense that it could be a disaster or an opportunity. How it actually turns out is up to us. Do we point fingers and blame, which would likely exacerbate the problem, or do we teach (not preach) the brotherhood of man?