I would tolerate it because I think that's how he needs to act to keep the project from becoming a POS. Being nice/courteous often gets you design by committee results.
Also, I might be swayed by his credibility, but what he's saying sounds reasonable.
I don't think anyone has really argued about WHAT he said. It's just a question of how he says it. There are many, much politer (and probably more effective) ways to say the same thing.
Well that was part of what I was saying - being able to reprimand effectively is part of what makes him a good leader for this thing. Being excessively polite and sugar coating everything doesn't instill the same desire to do things right next time. I think he's acting exactly as he needs to.
You're creating a strawman -- there's a big gulf between "being rude" and "being excessively polite." On top of that, I've never seen any proof that suggests that leaders who create shame & embarrassment & anger work better than leaders who inspire.
Also, I might be swayed by his credibility, but what he's saying sounds reasonable.