It is not in today's world there are only few who does this it is all from the history that they considered brahmins as an upper caste people and schedule tribe and caste peoples as lower caste people because there was not UNIFORM single rules that every person irrespective of castes should be followed but that has come to very low level after the formation of our CONSTITUTION and struggle of few peoples.

Any person should not hate or bring differences with any other person because of his castes or religion.

IF a PERSON wants to create difference with other people then that person should do with his success, positive views and struggles done by that person in their life.