I think there is two types of racism; that born of hate, and that born of ignorance. Many of our parents are racists born out of ignorance, they never knew "those others" and so fear them. This doesn't make them "bad" people, just uninformed. I had a friend drop something off to my mother in law (she's 75). She called me later and said
"Your friend came by"
I say "yes?"
Mom whispers "she's black!"
(forgive me, I had to say it to her) "GASP! Do you think she knows?"
Mom says "she seemed nice!" Note of surprise in her voice.
This is racism due to fear of the unknown other. Racism that takes that fear and turns it into hate should be NEVER be tolerated. This type of racism crosses all ethnic boundaries, and I think has done more harm in this world than any other thing.
Sorry for the long post, but as a grandmother of mixed children, and having friends with that number tattoo on their arm, hearing their first hand stories of hate unleashed on them, makes me realize the amount of hurt done in this world.

Robin