I think that's being taken a little out of context.

I think it might be more clear if Hamill said "I never heard him humiliate anybody, even unintentionally", which would be notable because-- and I know this sounds bad but hear me out-- I think by nature of filming, people get humiliated unintentionally by directors sometimes. And I don't even think that makes the directors wrong or bad, if they're going to go about their job and do it well most of the time they're more concerned with whether they're making a good movie than whether they're tactfully handling someone else's public suggestion or something-- and sometimes that leads to someone being humiliated when they get shot down or told they're doing something wrong.

But to be a film director and specifically go out of your way to handle every situation with grace and tact, that'd be a little notable. Not like, amazing unicorn special, but something you'd mention alongside "I've never seen him raise his voice"