Can "you" be used to refer to multiple people?

[Sinows]

I'm pretty sure I hear "you" used when referring to multiple people in casual/everyday speech, but is it okay to do that grammatically-speaking? Take this example for instance:

"What are good kids like you doing hanging out with that troublemaker?"

There are multiple kids, but "you" is being used to refer to them.

[Alan]

Yes, 'you' is both a singular and a plural pronoun.