In the not too distant future, parents have the option to "genetically design" their offspring. As a result most of Danny's classmates have been given every genetic advantage their parents could afford. Unfortunately for Danny, his parents had him "naturally" and he does not possess these enhancements.
This is what earns him the misguided title of "Dirtbag".

Danny understands more than anyone about the reality of being yourself and how you look or the abilities you have don't necessarily make you a better person.