The problem is that people often think that if we say a man is superior in something, then he's ABSOLUTELY superior, which is stupid. You can have a better IQ, it doesn't mean you have more human dignity. Even if, for example, every black people had a lower IQ than every white people, it would not mean they had less human dignity. Therefore, when someone says x is superior to y, there's no reason to feel offended if he doesn't speak about human dignity.