Fool. Behavior based classification of people in to categories exists in every society and this is nothing but the essence of original caste system. Its just that you have not been told about this in the Holy Quran. Like I said, Holy Quran did not document every aspect of the God or ALLAH or ALL pervading divinity's creation, and this is one such aspect that is nothing but diversificaion of the entities int he creation. You will never be able to eliminate it, since diversification is the essence of the creation and only aspect in which the universe unites is only in the realization of ALL PERVADING DIVINITY rather than anything else and that tooo, not in the forseeable future.
