Andrew Sullivan asks
Remember when the conventional elite wisdom was that racial difference was entirely a social construction and had no basis in genetics?
He links to this article on genetic research that confounds such a line of thinking.
That serious individuals could have ever entertained the idea that race is just a figment of society boggles the mind. I suppose that this sort of whackball theorizing is an overreaction to the opposite extreme that grossly exaggerates racial differences, and/or invents such differences out of whole cloth.
Coincidentally, the phrase "conventional wisdom" was invented by John Kenneth Galbraith.