How did Sai Baba demonstrate his indifference to caste distinctions and concepts of ritual purity?

Sai Baba consistently showed that he was above all considerations of caste and ritual purity. As described in Chapter 7, even the "best of Brahmins" and Agnihotris, who are keepers of the sacred fire and traditionally very strict about ritual purity, would abandon their pride and prostrate before him. This act amazed onlookers. The chapter further illustrates his complete lack of ego regarding the body and purity by stating that his mind felt no disgust even if a dog were to put its mouth into the food. For Baba, there was no distinction of birth, and he treated all castes, whether Shudra or outcaste, as the same.