I understand your reaction and hope it made her think. Unfortunately, I have watched SpongeBob Squarepants. My granddaughter used to watch it a couple of years ago (she is eleven now and has seemingly outgrown it). I would sit with her from time-to-time. hoping to discover what was the show's fascination.
I cannot say how often I would sit for a few minutes and finally mutter to myself, "What the HELL is this???"
One of my personal sayings is 'dog stupid'. I would describe SpongeBob as dog stupid but I prefer not insulting dogs.