I saw. He posted something he knew would upset Castiel, for his own amusement and likely to bait us and the Winchesters into responding. In Raphael's opinion, Crowley needed to viciously smitted, for many reasons - thinking himself, the bastard stain of a child Lucifer had created that he was thinking he could threaten an archangel being the chief of them, but there were many other reasons - he might hated Castiel, but he didn't want a piece of demon filth touching him either.

He wants to separate Castiel from his brothers, I believe. And while Raphael did believe that to be truth, he wasn't above using Balthazar as leverage to pry Castiel away from him.