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That sounds like the first theory in the linked Wikipedia article.

> Mate selection. Automatic, stimulus-driven appraisals of uncanny stimuli elicit aversion by activating an evolved cognitive mechanism for the avoidance of selecting mates with low fertility, poor hormonal health, or ineffective immune systems based on visible features of the face and body that are predictive of those traits.

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It’s very surprising that in-group/out-group factors didn’t really make the theories’ section.

“Looks human, but not quite what I’m used to.”

Seems like a decent way to quickly spot nonmembers of a social group. I wonder if an experiment could classify the revulsion and compare/contrast it to something like, when a person meets someone of an unfamiliar subculture.

Oh you are right. I have to admit when I got to that part of the page my eyes were drawn to the image of that weird looking "Repliee Q2" robot.

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