Why do Indians in general hate each other ?

My personal perception is the way we were raised. The famous situation like Sharma ji ka beta yeh kar raha hai, itna aage badh gaya. God I always hated those kind of kids. what I mean to say in a really crude way is, due to competition everywhere and comparison by others we have always put ourselves down. And then those failures led to looking for reasons in religion, regionalism and the list went on from there. Of course this is not so simple as I have put. My fellow Indians , what are your thoughts ?