Are you sure you did not mean to write "IMNSHO"---"In my not-so-humble opinion"?
Now, in reading that, do you assume that I am wise or that I am a wise ass?
If you assume either, then you make a mistake of ego, projecting your thoughts onto my words.
In any situation, the only ego I can actually control is my own. In Graham's situation, why would I
presume to know his instructor's mind? That would be my ego out of control, coloring the truth of the situation.
Fortunately for Graham, the lesson he took away from the situation did not ultimately depend either upon the teacher's intent or upon what we believe the teacher's intent was.