Wife E. and I had brunch this morning at a local restaurant. A White woman walked in and saw someone she recognised. She walked over to the table and sat down to greet them. Then a Black woman walked in and saw someone she recognised -- at the far side of the restaurant -- in fact, at the far side of two separate sections of the restaurant. They continued a conversation across the entire length of the restaurant without any discomfort. OBSERVATION: Guests didn't mind -- our cultures are used to each other. I once witnessed a sister of mine (on E.'s side) conducting a conversation at 600 metres / yards. I was astonished, so I measured out the distance. But notice, too, the difference with regard to a sense of privacy (or not).