I'm Scottish, living in Scotland for over 40 years. I think I know what I'm talking about on the banter. The only stabbing in the back is the plan with Marie. Deb was opposed to the plan but was forced to go along with it.They say she did but a cliché is a cliché for a reason.
I know a few Scotsmen to know a little bit about Scottish banter and I don't think it's what it is in the game. The banter thing is what the guy who drove the bus is doing. Everyone walks over MC, backstabs him, make him angry then he accepts and forgives them. Btw, whole story's starting point was MC was unable to forgive and forget so they put him in a jail. I'll probably give the game a shot when it's done but no need to follow it update by update tbh.