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> One is stupid in the same way one is red-haired; one belongs to the stupid set as one belongs to a blood group.

But we also have self-awareness. Stupid can be de-stupefied through learning. Whereas you can't really change your race or blood type.

Don't you feel yourself getting stupider with age ? Try and correct that by learning. Now imagine that some people are actually born that way

That's not a word. I think the phrase you were thinking of was "dumberer"