Some years ago, I ran a business with friend who was black. I was round his place one night whilst there was a programme about the USA in the 50 and 60 on TV. It occurred to me that, during the time I had known him, there were quite a few places in the southern states of the USA where it would have been, if not unlawful, at least inadvisable for me to go into a bar with my partner for a beer. Maybe there still are.