No, the point is that Dean is a dick. Sam was happy to see him doing better and happy to see Cas, and now all Dean wants is a freaking honeymoon tour across the states with him.

"Yeah I'll do that." Sam slams the door, stands sulkily by the trunk until Dean pops it for him, grabs his things and marches off to find some poor sap's car to hotwire and steal. You are a complete and utter dick, Dean.