I think it's more about the exceptionalism, tbh. Even (especially?) poor white Americans can be completely insufferable in similar ways.
It's the belief that you're a special people (or class) that arises with special treatment.
But yeah, in Norway you often marry that exceptionalism to the belief that no money problems will ever blight your life, and you're already pretty far along the path to full upper class English.
Mmm... is that the key? So if *everyone* can survive without working as long as they're incredibly frugal / survive binge-spends by basically doing nothing for the remainder of the month, it doesn't turn people into clueless arseholes?
I think the key thing here is inequality. Norway has relatively low (but rising) domestic inequality, but is basically a trust fund baby at an international level.
Norwegians have lots of holiday time and disposable income, and Norway has high immigration.
Everywhere you go, you are flooded with cheap consumer goods, whilst most countries you could visit, even in richer parts of Europe, exist on a sliding scale of poverty mismanagement compared w/home.
It's pretty, chill and well-kept here, messy and stressful and ugly "there".
So it's easy for Norwegians to fall into the mistaken belief that this isn't a confluence of extreme luck in terms of petrodollars and (mostly) competent political leadership, and rather it's because Norway is, and Norwegians are, very special.
See where this is going?