You can communicate directly without also being insulting. You don't need to literally feel what other people are feeling (empathy) to not go out of your way to make people feel bad about themselves. I don't think there's a concern with 'Linus didn't wish everyone a good morning/didn't compliment so-and-so's code while suggesting changes' but with 'Linus insulted people to their face'. The former is cuddly, the latter is politeness.