How do you deal with racism?

Let me narrow it down. How would you respond and how would you feel if someone you were close to turned out to actually hate you because they were raised to be racist? They may not be aware of it totally, of these tendencies. Basically, looking at the entire “friendship” it’s obvious now that this has been escalating into a worse and worse scenario and it’s gotten very serious. The fact that makes this situation unique is that one person, raised to be a local, attacking another person, of the same race, who is seen as an outsider.