Sadist Teacher/Playing With

Basic Trope: That one teacher who loves to torture their own students.

Straight: Teacher Stan regularly ridicules his students.
Exaggerated: Teacher Stan outright tortures his own students.
Downplayed: Teacher Stan is a jackass, but he's only targeting one student.
Justified: ???
Inverted: Teacher Stan is actually a fairly good and kind teacher.
Subverted: Teacher Stan is a jackass, but only has his students best interests in mind.
Double Subverted: It's a front.
Zig Zagged: Teacher Stan's anger and hatred of his students varies between writers.
Parodied: ???
Deconstructed: Teacher Stan's activities are discovered, and he's fired for it.
Reconstructed: ???
Averted: ???
Enforced: ???
Lampshaded: "Shouldn't this guy have been fired by now?
Invoked: ???
Exploited: ???
Defied: ???
Discussed: ???
Conversed: ???