I don't know. I'm the black sheep at work because I'm 21, uninterested in gossip, and don't have a crush on one of the managers. At school I'm 21, still uninterested in gossip, and don't spend my class breaks smoking in the gazebo and talking about lemons in people's trucks. That last one's still a mystery to me.
Everyone calls themselves black sheep. Maybe I'm a ginger sheep and just don't realize it. It would explain a lot.