How can I complain to two mega-corporate giants and have any impact? (see details)

I went to Target today and saw this girl’s t-shirt and was floored. This is a horrible message to give to tweens—that it is ‘awkward’ to be different, unique and creative. There was another one. What kind of message are these people trying to teach our tweens? I feel like these t-shirts indirectly promote bullying of kids that are different.
The t-shirts were created by Disney and are being sold by Target.
If I wanted to have an impact on this, what could I do, other than write letters? Has anyone had a success with standing up to something like this?