sigh This kind of ignorant discrimination goes on a lot in Japan too. A small percentage of ethnically Japanese people do NOT have black hair, but it is very much a standard. Some schools make kids dye it!
For me it's only my moustache area. It's funny trimming my beard and seeing the color change. Everyone jokes with my uncle that he's adopted, as the only red head in the family, but there's clearly some ginger genes in there