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Is autism just Neanderthal DNA showing through?

We know that Neanderthals make up a sizable minority of modern human ancestry, and genes can be carried for generations without expressing until they're combined in the right way.
We also know that one of the main destinations between Neanderthals and Homo Sapien is their social structure. Neanderthals lived in small groups rather than communities, and seemed to do a lot of their hunting, gathering, and other work alone.
Autism is often described as a lack of social instinct, but a lot of Autistic behaviour, such as growling at people or "stress sighing" (that weird Minecraft villager noise autists make when you tell them to stop being retarded), seems like instinctual behaviour that normal people lack.

Is it possible that when a person inherits specific gene pairs from their parents' Neanderthal heritage, they develop some or all of the social instincts of a Neanderthal in place of normal Homo Sapien instincts?