Having lived and worked in several countries, I think the concept of Jantelagen is rooted in the Protestant Reformation more than it being a specifically Nordic thing. Not only does it fit well with the general premise of the Protestant worldview, all countries that were early converts seem to have ingrained that particular perspective (under various names) in their collective cultures.
Don Jr really can’t stop saying the dumbest things and making himself or whoever he’s talking about look worse in the process. I’d say the apple doesn’t fall far from the tree, but I honestly think he’s actually even less aware than his dad.