I'm skeptical about spiritual masters. How did Sai Baba handle people who came to him with a "clinical interest" or a critical attitude?

The texts describe an instance of a man named Boss Dharamsee who came to Shirdi driven by curiosity and a desire to scrutinize Baba. As Chapter 35 details, Dharamsee internally questioned Baba's abilities when he was offered grapes with seeds, a variety he disliked. He thought, "If he is a saint, how does he not know That I do not like these grapes?" In response to this skeptical attitude, Baba not only gave him more grapes but also performed a miracle. When Dharamsee finally ate them on Baba's command, he found they had become seedless. This experience completely changed him; his "clinical scrutiny" vanished, his ego dropped away, and genuine love for the saint was born in his heart. This shows how Baba would address skepticism not through argument, but through direct, personal experience that dissolves doubt.