It's a part of life. I'm half black half cac so I've got friends in different circles and of different races.
I know exactly which white friends I can bring around my black & hispanic friends if they don't know them already. A few in particular I know for a fact I can't but we've been friends since kids so it'd be weak to dump em at this point. Anyone would say "just stop being friends with em" but its a bit more complicated in my mind.
Some of my white friends just have a completely skewed idea of what's ok to joke around about at what time. There's no concept of "time & place", and thats not limited to interacting with other races, that can be life in general. I'm too old to apologize for another man when he doesn't recognize he's wrong. So if I can't trust them to recognize when they've crossed a line with another circle of my friends, I don't bring em around again or I cut em loose.
Bottom line is I dont think a good portion of whites have awareness or understanding when it comes to other races, and I'm not gonna drive myself crazy trying to make everybody be friends with everybody else.