How was he a genius and a retard at the same time?

How was he a genius and a retard at the same time?

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Autism.

Jimmy neutron was worst in that aspect

>dexter
>jimmy neutron
>zim
>malcolm from malcolm in the middle
who else also fits this archetype?

High Int, Low Wis

Intelligence in Math and Science =/= Street Smarts or Social Skills

Is Zim really a genius or are Irkens just more advanced?

Dexter is very good at being book-smart, but lacks any sort of common sense, social cues, or ability to think critically.
...I guess, actually. He's on that super smart but socially awkward side.

...

he had underlings in the robot he used to attack the irken homeworld, so he's probably a bit smart by irken standards