Sam got a full ride to Stanford.
Dean couldn't be more proud of his fratellino. It was everything that he had wished for and more. Hopefully Sam would be able to find him a girl, or a guy, Dean didn't discriminate, and settle down after becoming a big shot lawyer.
He was prepared to congratulate his brother, give him a hug and a pat on the back like what had become common. Maybe he would call Bobby after this, Bobby knew how proud he was of Sammy already.
He hadn't been expecting the shouting match that broke out between Sam and John.
Those two really didn't realize how alike they were.
All the good qualities that John had were reflected in Sam, along with the same stubbornness that he was positive came from their mother.
It was a waste of time to him. Sammy earned it and, as far as he was concerned, deserved it the most out of all of them. John was acting like it was a huge deal when it wasn't.
Sammy knew how to protect himself, so why not let him go?
John, on the other hand, was likely to run out and get himself killed, and as much as Dean disliked him, he wasn't going to let his father die from his own stupidity.
So he stood back and watched Sam walk out the door.
And if he called Bobby and let him know that Sammy had made it, made it out of the life, well, that was for him and Bobby to know.