Focus on what feels good and forget the rest. If you want, you could try to frame this as how "we" kiss, as oppose to "I" and "you." Either the 2 of you do a good job, or better luck next time. You could also see if he wants to practice making the perfect kiss and trade feedback. Just remember, depending on his personality which I am not aware of, he may or may not be pretending to know things or trying to look smart. If a kiss feels good to both of you, you are probably doing it right. Good kisses are about sensation, not about following instructions.