I live in a high percentage hispanic population area. I honestly don't know one kid who doesn't know english and any adults who don't know any english. Some, a little and some very fluent. But, they all learn some.
However, I know some people who, if they hear someone speaking spanish in public, they get pissed. I always ask them, when you vacation in Mexico and are out with your friends, do you speak spanish?
They usually just storm off or change the subject.