"I'm fucking tired of the fact that you don't fix problems in the code you write" doesn't make any judgement about the person, it makes a factual judgement of what they did. He didn't say "you're a bad coder", he said "you create bugs and then don't fix them".

Sure, he could have omitted the word "fucking" there, which doesn't add much, but "I'm tired of the fact that you don't fix the problems in your code" is really good, direct, honest feedback.

I understand that the person receiving it might feel bad, but they might also feel bad with "I've noticed that sometimes you tend to leave some bugs unfixed, even if perhaps they were caused by your own commits". When you give feedback, you should steer away from making personal judgements, focus on the facts, and deliver the feedback calmly, and Linus' sentence hits two of the three, which isn't too bad.

Anglo cultures really do tend to walk on eggshells to avoid hurting feelings, which other cultures might find tiring and somewhat disingenuous.