Influence

A good teacher will do their best to integrate arrogant students into their class, to demonstrate humility, to offer an alternative way of behaving.
They aim to temper the student's ego. To cultivate a change of attitude.

One is taught in accordance to one’s fitness to learn.

(The Silent Flute)

But one or two hours a week simply does not add up to much.
Ultimately, the influence of the teacher is mild. The responsibility for change rests with the student.

If the student does not want to change - or becomes argumentative and defensive - the teacher may eventually ask the student to leave the class.