I think you're missing the point of the movie. Walt is from a different time, when talking about the differences in races and staying with your own group was an accepted and normal thing. Didn't mean it was right, but people gave each other crap without really hating each other. He gives the same crap to his barber and his construction buddy. But when it comes down to it, he realized we're all Americans, and there are good people and bad people of other races, and a real man will fight for the lives of the good ones, which is what he did. I'm not so sure the way we are so sensitized is completely a good thing these days. Obviously we have to deal with real racist hate, but everybody has gone completely off the deep end with the PC nonsense.