He's not saying the race is stupid. He is saying that it is more stupid, an operant he expounds on, revealing his underlying meaning as both accurate and mild. A factual statement is not and is never denigration.
If you and you specifically were the sole member of a race, for instance, his operant would rank your race below that of Black. This would be an observation, not a denigration.
But, if you are not Black, you are the recipient of favorable averaging. Your race would be less stupid than Black, despite you.
If you and you specifically were the sole member of a race, for instance, his operant would rank your race below that of Black. This would be an observation, not a denigration.
But, if you are not Black, you are the recipient of favorable averaging. Your race would be less stupid than Black, despite you.
I hope that helps.