It is not incorrect by a dictionary definition, but there are other ways of being incorrect. If I identified you at a party by saying "fallingknife is the ape s

It is not incorrect by a dictionary definition, but there are other ways of being incorrect. If I identified you at a party by saying "fallingknife is the ape sitting on the sofa" you would probably interpret it differently than if I had said "fallingknife is the person sitting on the sofa". Both are correct, but most people wouldn't interpret them as equally polite or friendly. Members of the set "person" are also members of the superset "ape", but that's irrelevant because the connotations are different, and it's the connotations that are annoying people.