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Autistic people typically get annoyed when things aren't neat and orderly/easily classifiable. I don't think the average American cares that much with categorizing people into racial/ethnic groups, but on here people are fucking obsessed with categorizing populations/phenotypes/genotypes/etc etc because they need a logical and consistent way to classify people. And it leads to a lot of heated debates because these identities did not form purely based off genetics (like African Americans are a genetic melting post of various African populations, a fair amount of European admixture, and a little native American admixture, so that identity is clearly based off culture).