The moral of the story just might be to never be in a group unless there are no spy phones allowed.
Thats pretty much what I tell my kids: assume that you are always being surveilled, and assume that anything you do will be portrayed in the worst possible light, if it should benefit someone to do so.
But I’ll also say this: if I were to EVER catch my kids singing a song like that under such circumstances, I WOULD kick their butts. Within the limits of the law, of I. That sort of nonsense, while protected under the 1st Amendment, simply has no place in civilized, polite society.