This is something that's been bubbling for a while, and this episode is a good time to let it out. I hate it when people simplify the horribleness of seasons 11-14 down to "Homer was too stupid."
One. Homer was dumbest in season five. Watch the episodes. It's all there.
Two. Homer's bad-era "stupidity" was sloppy writing and bad vocal delivery. Let's not throw the stupid baby out with the hacky bathwater. Stupid babies need the most attention.
Three. Frasier. Smart, snooty characters. Horrible, "Three's Company"-esque plots with annoying quips.
Four. Philip J. Fry. Way stupider than Homer ever was, but Fry's stupidity was always brilliantly written.
Homer being too stupid to see a "pull" sign on a door and resorting to kicking out the glass and crawling through was perfect. Swartzweldian, even. It's not even correct to say this was all just "stupid Homer," even if you mean it in a good way. It's very cute to see Homer sincerely trying to help his kids. And he even had moments of intelligence. He successfully manipulates the barflies with veiled insults, then tricks Lisa into using the popularity techniques. Also, Homer knew who those three ghosts were. That's two more than I did (Oscar Wilde).