Racism is a fact of life. We distrust people who are different. Religions use the fear of others to order people to kill them. Many religions are very racist, in that they separate people of the same race but by sects of a religion.
We have to stop judging people on the colour of their skin and start judging them by who they are and what they stand for. In Europe, we have a big problem. Muslims are allowed to be racists, Whites are not. The problem with Muslims committing sex crimes is being covered up or ignored for fear of upsetting the Muslim community. Which infers the Muslim Community accepts rape.
It's possible to split major cities with a large migrant population by race, religions and sects of that religion.
In Brno, Czech Republic, there are areas where the gypsies live. They have been in Eastern Europ for 600 years. Still, don't mix with Czech people.