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This is true and one of the main reasons students of any age do much better when in classes with classmates who are all at roughly the same level and are being taught by teachers who understand this.
This principle need have nothing to do with race.
It is basic pedagogy, and can be extrapolated to many other situations — employment, clubs, social circles, immigration, neighborhoods, and yes, also race and cultural background.
This is the main reason DEI is always guaranteed to fail.
The leftist craze to ‘end Whiteness’ is based on degrading Whites by forcing them to learn and work among people who are not at their level, culturally, morally or intellectually.
Civilizations progress only when the most talented people rise to the top, not the most pathological and self-aggrandizing ones. ABN
American Buddhist Net 