This is just a micro chasm of a much bigger issue. Most people just don’t know what it takes to do a job unless they have done it. But they feel free to express opinions in complete ignorance. I understand his point, but he could not have expressed it worse and missed the real target completely, as usual. I, too, recognized my senior year in college that being a loser teacher in high school required a stamina I knew I wasn’t cut out for, but later made up for it in a different way.