This happens the world over and is not remotely exclusive to Irvine or anywhere else.
I lived and worked in Switzerland for some years; my in-laws are Swiss, so I'm back there every now and then. It's somewhat common for affluent expats to purchase homes in Switzerland and send their children to international schools, which can cost anywhere from several to over a hundred thousand CHF per year in fees, despite the excellent Swiss public schools. The international schools are most often attended by children of English-speaking families, who sometimes spend their entire lives in Switzerland in a bubble, with virtually no Swiss contacts, and without speaking any of the 4 local official languages. And when I say they do not speak the language, it's not an exaggeration. Similar kinds of things happen in other places like the UAE, East Asia, etc.
So the phenomenon of Irvine FCBs purchasing properties as if money is no object is not particularly unusual, except perhaps in scale. When I was in Zurich, the expat community was extremely prominent, to the point where you could easily live indefinitely without speaking a word of German, whether at work or in day-to-day life. Such dynamics and a perceived lack of integration breed a common resentment against expats there, which I guess is similar to what some of the members here feel.