Veda Vyasa who wrote Mahabharat was born of fisherwoman and Valmiki was a chandala.
We even have instance of god chastising casteism. God Shiva appeared in the form of Chandala before Adhi Shankaracharya and told that "God is everywhere in the world".
All the hindu leaders like Adhi Shankaracharya, Vivekananda, Annamacharya, Sree Narayana guru, Aurobindo have worked to get rid of casteism in Hinduism. But who cares about hindu leaders. Caste system will always be associated with hinduism as it helps christian missionaries.
