Can you explain how Sai Baba demonstrated that he was beyond caste and ritual purity rules?

Chapter 7 illustrates Sai Baba's transcendence of caste and ritual purity in several ways. It notes that for someone like Him, who had no ego regarding the body, caste distinctions like Shudra or outcaste did not matter in the slightest. The text highlights that even the 'best of Brahmins' and ritually pure Agnihotris would abandon their pride and prostrate before Him. Furthermore, as described in this chapter, His indifference to conventional purity is shown by the example that He would feel no disgust even if a dog put its mouth into the food in the row of Fakirs.