Her portrayal of the wealthy was downright kind (which makes sense, because at a party you won't really get to know them) compared to the actual behavior of such people.

I've worked for and with them. Sure, a few of them are decent people, just like anyone else--and a bit embarrassed by the wealth they have. Usually, they try to get away from it--they have a desire to prove themselves, so they go into academia or the military or seminary and try to reinvent themselves, hiding their origins entirely. (Fred Trump, who became a pilot, is another example.) That might be 20 percent, the ones who deliberately leave the world of the wealthy, the world of unearned opportunity, the same way poors leave small towns in which there is no opportunity. The other 80 percent, the ones who like being in that sphere, are depraved fucking ghouls, and there are really no exceptions because their world is itself ghoulish.