One other thing to think about is one reason for diatribes like the one above is due to anger from some in his field and their proponents that they no longer have as much of a monopolized captive audience in their college courses/K-12 curricula as they did a few decades ago.
Whereas even recently some respectable/elite colleges mandated all college students take a Western Civ course regardless of major or history concentration of actual interest, there is now more of an allowance for students to substitute other history/social science courses which they may have more of an interest.
For instance, some can take other history courses to fulfill the requirement ranging from histories of foreign civilizations to that of technology(History of the Automobile or Aviation are two courses popular among STEM majors at a few universities I know of).
In short, this author sounds like someone who doesn’t like the fact students have and are demanding greater variety of choices in history/social science courses beyond Western Civ. Yes…I’m in the camp of him being an angry bitter Prof.
And I say this as someone who not only enjoyed taking an equivalent of Western Civ…but also substitute taught a part of it at a Community College for an adjunct friend who had a family emergency. Enjoyed covering the chapter on the Roman Empire to 2 1 hr sections of 50-70 students each.
And no surprise…the essay is residing on a partisan conservative website.