I have rewatched the last scene and if you carefully observe Bhavani was looking at Virat when he was telling her how the criminals are handled showing the stick. Her smirking face at that time certainly conveyed a different impression to Sai's mind. Not just Bhavani but Sonali and Karishma too gave the same sort of annoying smile. So Sai must have felt offended even though Virat's sense and intention in saying that was not wrong.