I don't teach but I've coached a handful of my kids teams. It's not a good feeling when you realize a kid legitimately just does not give a **** what you say. At risk of sounding all "back in the good ol' days", I can't imagine a young Clonefan32, or really anyone I knew for that matter, being so brazenly defiant. But at some point things shifted with kids defiance increasing and parents desire to do anything more than defend their child decreasing.
Man I hear ya. I've helped coach various youth sports and I hate to say it but WAY too many kids are flat out uncoachable. What's even more frustrating is when you see a kids parent just turn their head and pretend that they don't see their kid acting like a complete bastard. It's hard to get the kid to care if the parents don't.