Let's hope the Left continues to think the white race is a social construct. If they ever come to believe it actually exists they will advocate its extermination (though I'm sure wealthy liberal whites will not be touched).
That's not the way it works.
Racial differences are "social constructs" when it comes to the stereotypically bad traits of non-whites. When it comes to the White Devil and his alleged heritage of war and oppression (because no other race has ever waged war or oppressed/enslaved another human being), they are irredeemable genetic traits.
Similarly, when IQ tests reveal poor performance in the inner city or in the barrio, they are declared worthless, culturally biased, and arbitrary. When the same IQ test reveals low performance among poor whites, IQ becomes relevant again as a clear indicator of genetic inferiority.