I feel for him.....Perhaps he should try getting a job at a University, or
local Junior college.....The students he will find there are a bit more
mature, and easier to teach. But this reminds me of a story....

When I was in High School back East, I had a Geometry Teacher (Geometry I)
who was a drunk. She missed every Monday morning, and the rest of the week,
she just stared at the rear wall of the room and never said anything. After
a couple of days, one third of the class left, and never returned. The rest
of us divided ourselves into study groups, and assigned ourselves homework
from the book. In class, each group would put one of the homework problems
on the board, and discuss it. Then, we would go on to the next section of
the book and repeat the process. With only people who were actually
interested in learning the subject, the class went amazingly well, and we
all learned a lot about geometry. We all scored very high on the regence
examination at the end of the semester. And don't forget....We essentially
had no teacher at all! So when your husband complains that disruptive
students make it hard for him to teach, I can really identify with
that.....With no disruptive students, he wouldn't even have to come to
class. - They would learn without him even being there!