What strikes me is that the discussion is that Benedict said 'coloured' when he meant 'black', but he addressed the white dominance in brittish film, but not all minorities that are dominated by the white movie industrie are black, why should people be offended when called coloured when being called black is ok?
Actually, people who consider themselves to be politically correct will argue that people with black skin are African American not 'black'. I don't agree, since clearly not all people with black skin are from America or Africa. Political correctness has gotten way out of hand if you ask me. There are far too many SJW in internet land.
I don't identify people by their color normally, but if I were to trying identify one white guy amongst a group of "colored people" I would most likely say, "the white guy". Naturally if he were among other white people I'd try to find some other unique attribute and call him carrot top or neckbeard or "the dude in the pink shirt" instead. lol
Interestingly enough, I have never used or even heard anyone else use the term 'yellow guy' when referring to an Asian fellow or 'red man' when talking about a Native American Indian. Only recently have I heard 'brown' being used to identify East Indians, but usually it's been by other Indians.
Anyway, I don't see any harm in using colors to identify people (whose ethnicity eludes you) as long as you remain respectful.