As I understand it the difference between rude and mean is a matter of intention. With mean being intentional. Linus behavior is frequently explained with him only behaving that way when people deserve it. Making him, or at least his behavior, mean rather than rude.
Which is a pile of complete BS. If all actions were fully justified simply because the person doing the deed felt a certain way, then we would need no laws nor rules of conduct because everyone would always show the correct behavior. He's more than old enough to know that the kind of language he uses is meant to be insulting. He's a jackass.
