Never in my wildest dreams did I imagine I’d earn the ire of a character named Turd Flinging Monkey, the nom de plume of a popular online activist. A leader in the Men Going Their Own Way (MGTOW) movement, which encourages men to avoid romantic relationships with women, Monkey did not take kindly to my new Prager University video talking up the benefits of marriage for men. In the video, I noted, among other things, that married men work harder (about 400 more hours), smarter (they’re less likely to quit without having found another job), and more successfully (they make...