How is this a "story" ? Rg Veda do not talk about "creation" of the Varna, it explains "Creation' itself you idiot. Purusha Sukta itself only attempts to explain the universe w.r.t a human form. Th Mandala explains how Human nature has four categories based on qualities that make Human society sustainable.
Who has denied the existence of the Varna in Hinduism ? or Shudras ? or Kshtriyas ? That would be like denying the existence of courage, intellect, will, ambition, hardwork etc in Humans. All of these very much exist in varied proportion.
The Caste rigidity was a product of the economic, social, political and cultural envionrment. The same as caste was formed AL OVER THE WORLD. You just happens to be Ignorant of existence of caste in other parts of the world. From Europe, America, to Africa, to Japan.
Brahmins themselves were only 2-4% of the population, so if ever there was discrimination, it has to be PRACTISED by the MAJORITY. The ONLY Discrimination was against the Dalits since they were outcast's.
I am not the one claiming to be a Brahmin, go preach to those who claimed it in PDF