With people that don't choose to watch, then fine.
Then you are the people that need to be hit about the head from time to time.
"I'm fine! I've never had a problem with black people."
Because you don't know the difference between white people and black people, that statement by itself is racist.
"It's cool. My best friend is a black guy".
Whatever the hell your best friend is, it should not be "A black guy". If your friend is that great, why should it matter?
Even if it is, then go about your business. Pointing him out as black is racist. for so many reasons.
The point is to refer to your friend as neither black or white, chinese or korean, this or that.
Refer to him as confidant and/or amigo.
Or my best friend.