Kim also subtly represents a flavor of (classical) liberal populism that is at odds with the neoliberal empire-making much of the ultra-rich engage in. Both make the bulk of their money by exploiting resources that they have a dubious claim to (from a humanistic perspective), but the people that the latter tend to exploit were instead the beneficiaries of his exploitation. Anyone who flips the script like that is going to find themselves in the crosshairs, because it seeds dangerous ideas about what the average person deserves in the way of dignity and material/cultural goods.

He's also not old money or especially supportive of old money; he's just some script kiddy who scammed his way to the top on the back of the kind of confidence that tends to only come when you're built like an NFL lineman but can also read documentation. The seethe is easy to understand.