Do racist people know that they're racist?

My brother in law is horribly racist. He always has been. But I don’t think he sees himself as racist. I think he actually believes that black people ARE dumb and inferior to whites. As far as he’s concerned, it’s the truth and there is nothing to apologize for.
I bet he had a stroke when Obama was elected! But I don’t know. I haven’t seen them much in the last 20 years, even though they only live 30 miles away.