Of Course, the Teacher should allow the rebellious student to prove his point. If that is wrong, the Teacher should immediately show and prove the correct explanation before that class ends, not wasting any more time with that rebellious student, which affect the whole class.
The teacher should not allow the rebellious student to hijack the whole class for days, months, years , decades and centuries, during which the other students miserably fail, suffer and even die. And this is what Almighty Jah does as per WT