In what ways did Sai Baba's behavior go against the traditional caste rules and ideas of purity described in Chapter 7?

Sai Baba's actions, as described in Chapter 7, fundamentally challenged the rigid caste system and notions of ritual purity. The text notes that the 'best of Brahmins' and even 'Agnihotris' (keepers of the sacred fire) would abandon their pride and prostrate before him, despite the ambiguity of his origins. Chapter 7 further explains that for Baba, caste 'did not matter even in the slightest degree,' and he was the same to all. His complete lack of ego regarding the body is highlighted by the fact that he felt no disgust even if a dog put its mouth into the food, a powerful statement against ideas of contamination.