I don't think One Coarse Meal is the worst because there's an excellent opening scene, and those really dark scenes could be seen as Mr. Krabs going too far (as Casey Alexander wrote on Twitter), if there wasn't a ridiculous, sad ending....
I don't think A Pal for Gary is the worst, because... well... because of the fight scene and the monster, which remind me how awesome of a fan favorite this could have been if SpongeBob (who is a bunch of shrimp in the episode) and some kind of confusing moral weren't thrown in.
To be honest, the only bad thing about the Suicide joke in One coarse meal was that Plankton who just wanted to steal something got it, and it was a childrens cartoon, IT WAS LITERALLY RATED TV-Y7. Oh yeah, the main reason that i hate One Coarse Meal and put it at #3 is because of Mr.Krabs doesn't even get a punishment.
But i know A Pal for gary is the worst spongebob episode of all time.