Just watched T2, and fuck if John Connor doesn't start out as a complete shit in that film.
Two of the first things he does: rip off some guy's bank account, and have the Terminator break the hand of a guy who until the previous minute had been trying to help him.
These two guys are just going about their business, trying to make a living in a cold, hard world, when they hear a kid screaming for help. They look over and see the kid being confronted by a huge, intimidating man. Against their better judgment they decide to help the kid. But when they get there, the kid tells them to fuck off. So one of them tells the kid he's a dipshit for fucking them around like that, and suddenly the big scary man, who a minute ago could have been molesting the kid for all they knew, grabs one of them, breaks his hand, and almost shoots him in the face.
I don't accept the premise that the future leader of humanity would ever say "Are you calling moi a dipshit?" with a stupid smirk on his face.