Going back to the OP's point, I agree that there is a big chance for hurt feelings, especially on the part of teen girls. I remember when the old superstar studios was there. I wanted to be an actor when I grew up, and I tried so hard to get a part in the show. When I did not get one, I was so sad, I cried. It did ruin the morning for me (what can I say I was a hormonal teen girl). My parents got mad at me for acting that way, which made the whole scene worse.
Now, not being chosen is one thing, but actually being critiqued after you try your hardest is another.
I would think if I wanted to be a singer, got into the audition process, actually sang, and was critiqued or told I was not a good enough singer to be in the show, at that age I would really be devastated. I don't think your average teen girl who has aspirations to be a singer is really prepared to handle the rejection that comes along. The average teen girl will probably grow out of her desire to be a singer naturally in a few years- and won't ever get to the professional point of having to take rejection. I think this attraction going to be hard on a lot of teen girls, and their families!