You can’t live as long as Cas has or seen as much as Cas has and not see humans as inferior beings, even subconsciously. But nooooooo, Cas will want to fuck all the pretty girls now that he’s human. In reality, they would seem so immature to him after all he’s been through and seen.

Wait, if Castiel is going to see humans as beneath him, then why would he want to sleep with Dean? It's because Dean is not a pretty girl, isn't it?