I've been an instructor/mentor at several intervals since I started military service in 1989, and am one of the senior instructors at a DoD training academy now - I don't have the experience with the high schoolers of today (my wife does), but I do see some "difficult learners" in the enlisted/officer/civilian ranks to this day. It's mind boggling - they just don't realize they are robbing themselves of a chance to learn.
On the other hand, I just witnessed a riding instructor the other day yelling and cursing a blue streak at a young (maybe late teens/early 20s) student. Granted, I had not been paying much attention until that point - had my hands full with a chestnut mare - but by the time it got my attention the whole scene struck me as unprofessional and unnecessary. Maybe it's because I know how to get someone's attention without raising my voice. But everyone has their style, I suppose, and again I didn't see what the issue was to begin with.
The young girl started to quit, but stuck with it and the scene de-escalated. Good for her.