There's a reason why hospitals in the Bronx wouldn't put Dominican patients in the same rooms as Puerto Rican patients...

Coincidentally, there's a reason why Caribbeans live in black neighbourhoods and not Latino ones. :-/

With that said, I suspect it's because they're used to meeting bourgeois types, um, crude about these issues compared to other people within our own ethnic group. They're basically meeting white people that "season their chicken". I suspect one could argue that our immigration policy should select for that, and I suspect that's why East Asian immigrants are well liked in North America....