Maybe Papyrus doesn't get mad about Sans' puns, but rather how easily he can make them. Why else would Papyrus laugh and be proud when he makes puns? He's not as clever as Sans is. Anyway I was drifting off...
I like when papyrus makes puns. It's less annoying bc he has a better sense of moment for them. Sans just randomly throws his jokes everywhere, interrupting the situation and annoying not only Papyrus but me as well.
i don't ever remember Papyrus ever doing puns in the game, but i see them all the time in fan comics, did i just missed them or something, because i would of thought he hate doing them?