The point of norms is not that they are justified because they worked well for the ancestors (even though that is often literally claimed to be the case, and even materially the case), but simply that "this is the way we do it", and you are often considered wrong for asking.
Almost nobody is able to clearly articulate anything they have not heard anywhere else.
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I don't think so. Stereotypes are simply generalizations over previous observations.
End of conversation
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