Spiritual master-disciple etiquette

Srila Prabhupada is supposed to have said that he was 80% lenient, but that a spiritual master is to chastise his disciples. This raises the question of the stern guru and implies that there is a certain aspect of Vedic culture that Srila Prabhupada intentionally did NOT import to the West.In a leccture in LA on 27 Nov68 on BG 2.8-12 he said: “…the spiritual master or father or teacher has got right to chastise his son or disciple… A son is never dissatisfied when father chastises. That is the etiquette everywhere. Even the father is sometimes violent, the child or the son tolerates. A typical example is Prahlada Maharaja. Innocent child, Krsna conscious child, but father torturing. He never says anything. All right.' Similarly Krsna, just after taking the position of the spiritual master, is designating Arjuna as a grand fool. Just like Caitanya Mahaprabhu also said thatMy spiritual master found Me a great fool.’ Was Caitanya Mahaprabhu a fool? And can it be possible that anyone can become the spiritual master of Caitanya Mahaprabhu? Both things are impossible. Caitanya Mahaprabhu, even not accepting Him as incarnation of Krsna, if simply you accept Him as ordinary scholar or man, there was no comparison of His scholarship. But He said that `My spiritual master found Me a great fool.’ What is that meaning?”