@Rockhead,
I thought for a while that people were getting less strange about all this, but I am apt to be wrong.
I know of many good inter racial/cultural relationships - now too numerous to go on about. And many intra culture bad ones. But, as I sometimes mention, I'm from california, coastal california. One of my first friends at university was in my bacti class; she was, I suppose, of european extraction, like me. I didn't know about the nuances of that, a favorite subject being geography and capitol cities, sort of world interested from 4th grade. I liked her boyfriend, a japanese american, too. Soon I got an invite to their wedding, she pregnant. In retrospect, this was one of the happiest weddings I've been to, multi culture or not. Pregnant at fancy-ish wedding between cultures was a major deal in 1962 - at least re my then view of the world. Will always remember that, Jean and Masaya.
I think it is hard for people now to imaging the stigmas that floated around pre civil rights era. Even the baby boomers seem slightly out of it as a group to me, re understanding the earlier strictures. Of course not all bbs.
I've no idea now what was going on then - it might have all been about class and pride.