As with most things it depends, I went to basically the most expensive school in my state (Not in the US), and never realized that it wasn't normal for everyone

As with most things it depends, I went to basically the most expensive school in my state (Not in the US), and never realized that it wasn't normal for everyone to actually learn the second language everyone has to take Only after getting exposed to the rest of the world (And people making a big deal out of it) did I realize that it was a "class" thing If the bilinguals are mainly economic migrants, sure, I'd expect the correlation to be different