Personally - even if the comment wasn't serious I am glad it received a serious answer which redeemed the original comment. Most of the time I choose to downvote low effort comments like semi-relevant quotes from pop culture, because it triggers my post-traumatic ticks from past reddit experience.
It is a joke related to the episode 9 of the first season of Rick and Morty, where Jerry (the dad of Morty) does not want to change his belief concerning this fact he learned in highschool and make a big fuzz about it.