I don't know about the younger generation's behavior on-stage...
But at the store we regularly have new kids working. Some of them work out, and their work is deeply appreciated. Some of them are pains in the patootie, and nobody appreciates them. And every so often, one of them gets dumped, and they aren't missed one bit.
The trick is to focus on the kids who work out, who are usually the quieter ones who take a certain pride in getting the job done right, and who get rewarded for their efforts later on. I'm thinking right now of Mike, who used to wrangle carts and now works in the meat department, and Kenny, who used to be a bagger and now spends most of his days "shopping back" items that customers have decided not to purchase for whatever reason. Both are dedicated to their jobs, and knowing them offsets the less-than-stellar kids who don't share their attitude.
Kenny, btw, started with us as a bagger at fourteen, and has already been promoted to the more responsible position at fifteen. He is, in a word, a hot-dog, and is going to go places.
