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.
We agree on that. The best punishment might well have been to tell the parents. It would’ve isolated the jerks from the kids whose parents set standards and demand that they are met.