How did Sai Baba's actions show that he was completely beyond caste distinctions and ideas of ritual purity?

Sai Baba demonstrated his transcendence of caste and ritual purity through his daily interactions and attitude. According to Chapter 7, he had no ego regarding his body and treated all castes as the same, with no distinction of birth. This is powerfully illustrated by the fact that the 'best of Brahmins' and proud Agnihotris (keepers of the sacred fire) would abandon their strict notions of ritual purity to prostrate before him. The chapter also provides a stark example of his indifference to conventional purity rules, noting that his mind felt 'no disgust' even if a dog were to put its mouth into the food, showing that to him, all beings were equal and such distinctions were meaningless.