> based on someone’s skin colour you are determining their culture/heritage. People can have more than one cultural background, and American "black culture" is

> based on someone’s skin colour you are determining their culture/heritage. People can have more than one cultural background, and American "black culture" is the common cultural heritage around the experience of being black in America, which has a lot of broad commonalities regardless of where in the country you are, and also locale-specific subcultures (e.g. west coast vs east coast vs deep south). Like the whole point of Fresh Prince of Bel-Air was that Will Smith and his uncle's family had very different subcultural contexts (although their divide was less "Nigeria vs Jamaica" and more a class divide), but also shared the broader experience of being black in America.