I've been wondering, when Linus expresses his anger at different people on mailing lists, does he mean it? When he calls someone a fucking idiot and tells them

I've been wondering, when Linus expresses his anger at different people on mailing lists, does he mean it? When he calls someone a fucking idiot and tells them to shut the fuck up, does he really want to offend the person or his actions/code? I feel like it's the latter, i.e. when you are called a moron, you probably did something stupid. On the other hand, once you understand this, doesn't it devalue all the harsh words, i.e. "moron is new horrible"? For words to be insulting they have to be used sparingly, right? I am not a subscriber of LKML, so I am not sure, but I think that Linus understands this and doesn't abuse/insult anyone too often, or it will not be too effective. Otherwise, everyone would consider him a dick instead of a blunt and straightforward person, wouldn't they?