I don't have a lot of time, but I wanted to clarify that I am in NO WAY comparing Sam's summer to Dean's forty years in Hell. I'm simply stating that that summer made them both grow and change in different ways because of the nature of their experiences.
And I think I need to see the end of this episode again in order to better compare the boys hurtful statements. And I will be seeing it again tonight, because I'm going home and my family watches everything the next day.