I know the GhostFacers episode was supposed to be a meta joke in that the documentary/reality tv cameras were the only ones to pick up on the cursing that Dean and Sam were actually doing all the time that we never saw. And that’s funny. But I find it’s far more hilarious to think that Harry and Ed are the only beings in the universe that annoy the Winchesters so much that they actually curse. Not Crowley. Not Godstiel. Not even Dick Roman. Even freaking Metatron. NOT EVEN ZACHARIAH made Dean so annoyed that he said, “Angel or not, I will stab you in the fucking face.” He actually stabbed Zachariah in the fucking face, and still never cursed at him.
Only Harry and Ed annoyed him so much that he dropped that language. That’s how I like to see it.