All I can say is that we live in an imperfect world, where hatred, selfishness and greed exist. They show up in form of racism in some way.
You will be surprised that ethnical discrimination exist too in a country of the same race. I keep saying that, all these are because people are ignorant, of the beauty of the people is in its diversity.
We just have to trust that nothing goes unpunished, eventually, while we continue to be a good role model where we find ourselves.