That they couldn't be anything? Right, right, because he's just human.

"Fuck this," Dean bites, raking a hand through his hair. "Fuck you, and...fuck everything, I shoulda known it was all too good to be true. Maybe you'll get lucky and another angel'll show up so you can screw around with it."

Because normal people can't possibly surmount to much for a Heavenly being.

"I'm outta here."