I can see why people, and not just the BLM folks, would find that archaic word offensive. Although it would be hypocritical for people who use worse words to pretend to be offended, but that is nothing new. Some people will find offense in anything but that does not mean that ordinary people who do not have a chip on their shoulder might be more comfortable with using a different name. Although, true, a “wrong,” historical name might teach more history.
So when are they going to ban Spanish and Portuguese speakers from saying “negro” (black) in their language?