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Didn’t like their comment either but what in the world kind of racist response is this. Where did this come from?
(Disclaimer: I have Slavic roots.)
Having said that, this is pretty lazy stereotyping (Slavic -> binary thinking).
Some societies may encourage more categorical, absolutist, or hierarchical ways of thinking, depending on their educational systems, political traditions, and social norms.
But such an analysis would probably have to be done at a country level.