Linus is playing the "people want me to be PC" card, and mixing it in with some anti-American-ism for popularity.
Nobody's asking him to be PC. Not many people are asking him to be friendly or polite. People are asking him to not be publicly abusive, to not be a bully, and to recognize the impact his words have on others. It is perfectly possible to be an effective manager and leader without being abusive and bullying. Stick to the facts, among other things.
"Your code check-in appears to cause a bunch of compile errors, so I've rolled it back. Also, I've noticed that this isn't the first time. We're a large-scale project and it is helpful if contributors extensively validate their contributions."
"Don't you know how to validate your code? Stop wasting my time! Come back to me when you've evolved past a chimpanzee." ...and also not:
"Hello! Thank you for your code check-in! Now, I'm sorry to have to be the bearer of bad news, but there's a small problem with your code. If it's not too much trouble...." etc etc.