No, because guess what. I can correct your grammar, unlike a brain dead person who would be unable to type. Onto the correcting part, you should have said, "What are you, brain dead?" NOT "... What are you? a brain dead?" No ellipsis, as you aren't finishing a sentence you've started half of, question mark does not come until after the sentence, Fist question mark in your sentence is supposed to be a comma, and you're referring brain dead people as if they're a race, so no a after the comma. Finally, even if that a WAS grammatically correct, you still didn't capitalize it.
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