Had a professor in college from Nigeria. Spoke the Queen’s English, wore a suit and tie to class every day. Affable guy but all business in class.
I was seated a row away from a couple of Basketball Americans who I overheard assuming that the “brother” was going to cut them breaks and let them slide.
They were sorely disappointed and called this prof the same name that a Klansman would have.
Some years ago, I got cut off in traffic by a black lady. At the next light, I was going to give her a piece of my mind, but she spoke first, in a British accent and apologizing. Very nice-looking woman. Her accent and courtesy plowed through my anger. I was instantly enamored. Politeness and a British accent go a long way.