Pity the writers seem to have forgotten that Dean raised this ungrateful punk

Oh god, I know. I had the same reaction in 6x02 when Sam asked something about how Dean knew how to change a diaper/was so good with kids/whatever and then made some reference to Ben and Dean made a sound and said, "Yeah, Ben" and I thought that he must be thinking, "Who do you think changed your diapers, Sam?"