If a person is constantly dissatisfied with your performance, it indicates that they have a core dissatisfaction that is significant but hard to articulate. This could stem from a lack of legitimacy or something too sensitive to mention directly, leaving them unable to address it openly. Instead, they will express this through a series of seemingly reasonable but ultimately trivial grievances. For example, they might focus on minor issues, such as slight flaws in work processes or differences in lifestyle habits. By repeatedly emphasizing these types of complaints, they maintain a facade of reasonableness while indirectly releasing their true demands that are wrapped in criticism.