I think he was toughest of all on Arittha - humiliating him in front of the Bhikkhu Sangha.
MN 22 Alagaddupama Sutta: The Snake Simile
translated from the Pali by Nyanaponika Thera
..........."Is it true, Arittha, that you have conceived this pernicious view
: 'There are things called "obstructions" by the Blessed One. As I understand his teaching those things are not necessarily obstructive for him who pursues them'?" — "Yes, indeed, Lord, I understand the teaching of the Blessed One in this way that those things called 'obstructions' by the Blessed One, are not necessarily obstructive for him who pursues them."
6. "Of whom do you know, foolish man
, that I have taught to him the teaching in that manner? Did I not, foolish man
, speak in many ways of those obstructive things that they are obstructions indeed, and that they necessarily obstruct him who pursues them? Sense desires, so I have said, bring little enjoyment, and much suffering and disappointment. The perils in them are greater. Sense desires are like bare bones, have I said; they are like a lump of flesh... they are like a snake's head, have I said. They bring much suffering and disappointment. The perils in them are greater. But you, O foolish man, have misrepresented us by what you personally have wrongly grasped. You have undermined your own (future) and have created much demerit. This, foolish man, will bring you much harm and suffering for a long time."
7. Then the Blessed One addressed the monks thus: "What do you think, O monks: has that monk Arittha, formerly of the vulture killers, produced any spark (of understanding) in this teaching and discipline?" — "How should that be, Lord? Certainly not, O Lord."After these words the monk Arittha, formerly of the vulture killers, sat silent, confused, with his shoulders drooping and his head bent, brooding and incapable of making a rejoinder.
Then the Blessed One, knowing (his condition), spoke to him
: "You will be known, foolish man, by what is your own pernicious view,
I shall now question the monks about this."
.......................http://www.accesstoinsight.org/tipitaka ... .nypo.html
I hope Arittha learned from this verbal trouncing, and came back to the right path.