Mei Zhehao felt indignant for his mother. Even though she was Mei Uncle's legitimate wife, in the eyes of others, she was seen as the other woman, Xiaosan. After all, no one would expect that the woman who lived in the Mei Family for so many years lacked any legal status and proper recognition.
If it were her, she wouldn't want her mother to endure such humiliation and disdain, sharing a husband with another woman, especially when the other woman was such a cause for concern. The sense of grievance was imaginable.
However, everyone has their own way of thinking. Perhaps Mei Zhehao's mother didn't feel the same, otherwise, such a seemingly delicate person wouldn't have been so determined to marry Mei Uncle in the first place.