Left-wing racialism has become the lexicon of the Ivy League, so it is only natural that its feeder schools have adopted it as well—partly out of idealism, partly out of cynicism. The most prestigious of these is Phillips Exeter Academy. The school has graduated senators, diplomats, generals, and titans of industry. In the past, this meant assimilating the manners and mores of America’s elite Protestant culture. Today, it means drilling students in ideological concepts such as “white privilege,” “white fragility,” and “queer theory.” The Exeter man is prepared to rule or, at a minimum, to conform to the culture of...