[swsieber]

“He who takes offense when offense was not intended is a fool, yet he who takes offense when offense is intended is an even greater fool for he has succumbed to the will of his adversary.” ― Brigham Young

That said, I do think the GP has a point: it is possible to divide feedback according to the two sets of criteria mentioned, and that things go better when we craft our communication to be the nicer one (he called it critique, you call it constructive criticism).

I'm not going to use the fact that people should be able to handle criticism to give mean feedback. And I think that's the point he's making - we should choose to be nice.