It’s a cocoon, perhaps, or an escape. It used to be worse. There used to be one bar where all the ex-pats went. It was just like in Prague where there where, for years, there were only one or two spots they flocked to, where they isolated themselves from the tumult of a post-Communist society.
People of color never get called ex-pats when they move to “the West.” And if POC all gather at one place like that, cops probably gets called.