I dont think he believes that for a second. Its good man management from him to publicly laugh it off.
He didn't laugh it off even publicly. As I said, I think he pitched it just right. He said he was angry when he went to sleep that night, and angry when he woke up the next morning, but he was okay when he was at Melwood because he knew what needed to be done to correct things. Then he moved the conversation on. That's fine. It certainly shows that he, unlike some, WAS thoroughly pissed off by that result, and he knew that something needed to be done about it.
It's no good people thinking if we beat a Palace side where the opponents were smiling away during the game, and hopefully beat a soon to be relegated Villa, then that somehow proves the City defeat was just a 'blip'. That's the attitude of people who've spent so long being among the also-rans that they've internalised the idea of it being somehow excusable losing to the top clubs. We now need to have standards that are almost impossibly high. So losing that badly against a rival does matter, as does not scoring in a succession of away games. So long as Klopp realises that, and of course he does, the Panglossian brigade can keep waffling away to their hearts' content.