Ugh, after a long day at work (and certainly not made any easier by some idiots on the other side of the country IE JFK) I was kinda hoping I wouldn't find this thread here, or at least you guys wouldn't have gone down this path.
I'll put it simply then, and maybe argue it tomorrow.
They broke the law. They really broke the law. Not a "oh its just fun" kind of broke the law, but a, "this flies in the face of FARs and SOPs and we all know its on a recorded line" kind of broke the law. Every controller at my facility agrees, this guy was an idiot. I don't care if no one was in danger or he was just parroting his dad, its not funny, its not professional. We live and die by our professionalism. If my voice even cracks and a pilot hears that, I can lose his trust in an instant. For all the controllers I know and respect, this is entire situation isn't a laughing matter.