bad boy is the kind of person who never introduces his parents to his friends because he is embarassed to call them his parents. Most kids go through that phase but some never grow out of it, bad boy is one. 
He is never friends with the "not dressed well" ones and looks down upon them. He doesn't get why Gandhi(despite his horrible dressup) was such a great leader. 
@adhikari_bandhu: we are not differentiating girls(who tend to eat less) from boys ;), Be a man, show them what you are made up of. Chara le khako jasto khayera sahariya hudaina. I don't eat less because I fear people judging me. If I am hungry I stack up my plate and even go for a second. If someone like you has a problem, I show them my middle finger and go for a third.