Sam already got set up for a fall under Dabb (see the BMOL storyline). Now whiny Princess Dean gets to be rude to everyone and they are all supposed to just roll over and take it - and he gets validated by an f'ing soulless prophet of god.*
*and that story just shat all over Sam's soulless story in S6 and the soulless stories in S11. If it's nothing worse than having your appendix out and asking yourself WWMRD, which Sam, as smart as he's supposed to be, couldn't manage to do, basically the show is saying Sam really is a monster inside. Thanks for nothing Buck-Lemming.