We have to start with admitting we're all racists. It's natural, it's part of our wiring. Civilisation is a process of overcoming our wiring.
A few years ago I did a masters degree in criminology as a hobby. I learned an awful lot of detail and it all fades with time. But I'll remember until I die one of the professors saying totally casually, as a throw away point, that "crime is normal". Meaning that we all commit crime and regularly too. When did you last break the speed limit? As a kid did you nick something from the store? Have you found something and not handed it in to the police? Taken an illegal drug? And that just the nice people.
Racism is normal.
The big question is how do we overcome what is normal?
Je suis Charlie. Je suis Ahmed. Je suis Juif. Je suis Parisien. I am Mancunian. I am Brum. I am London.I am Finland. Soy Barcelona
"Life, don't talk to me about life" - Marvin the Paranoid Android
"Science adjusts it's views based on what's observed.
Faith is the denial of observation so that Belief can be preserved."
- Tim Minchin, in his beat poem, Storm.