Problaby the T-shirt is about  teens´ ways and  teens´rebellious age. In a inciting tone, of course. 

      At the site  http://www.relativitshirts.com/servlet/the-Best-T-dsh-Shirts-%26-Tank-Tops/Categories   you can see more on this line of tought.

 For example: Broken Rules Are Made To Be Followed
 Despised Everywhere That I Go
  Defective Frontal Lobe"

And others, supposed to be funny?  Perhaps, but the end result may or may not be...