Foreign ideals are fleeting and do not deserve to exist.

Kid, boy, dude, Vasya, guy, fellow – they all mean roughly the same thing.

There was also a "gopnik" among them, and that's a completely different story.
Go with VisTrit.
"A group that doesn't think and behaves immorally, only for its own benefit."
Something like that.
There are five classmates there, 4 or 5, well, never mind.