I was in my 30’s going back to university for career purposes and I resented my time being wasted. The instructor had no business in the classroom. He needed to be in treatment.
He probably needed to have a few sherries with you fellows and to explain his theories more cogently. HE wasn't wasting your time, the program that required a useless course was wasting your time.
It has been known since the dawn of the University in the 13th century that alcohol facilitates learning. While you're at it, check out a copy of "The Student Prince."
While I was in (various) High Schools, I noted that there were a number of instructors who were worse than useless. Progress required rewiring around them.
A few others were truly inspirational and more than made up for the drones. One should always be an active participant in one's personal edumacation.