Man, Dean telling Sam that Cas is always alright… just NO!
That’s the whole problem. Sam and Dean (especially) don’t really see Cas. They don’t get how depressed and vulnerable and broken he is. He isn’t alright. He has never been alright. Cas needs someone to love him and care about him and worry about him so badly.
When Dean said that, I wanted to scream. And I hope that’s the point. We are getting some real lancing this season. From the brothers (mostly Sam) realizing how toxic and dangerous their codependency is to Sam talking to Dean about his guilt. Now, we need that same kind of introspection for Dean and Cas. I hope that’s the whole point of this story arc, to get Dean to understand Cas better and realize that he may be an angel, but he needs as much love as anyone.