Psychological protection mechanism: Many people think that when expressing different opinions, if their opinions are recognized, they will feel satisfied and comfortable. If you feel that your relatives are not satisfied with your slimming evaluation, it may be that you have gone too far, making your relatives feel that you don't care or counter criticism, triggering some kind of emotional or psychological protection mechanism.

Social pressure: In some cultures, slimming is regarded as an aesthetic standard. If your relatives may be dissatisfied with your slimming evaluation because of this cultural pressure, then it may be a manifestation of their concern and expectation for you.

Self-esteem: If your relatives' comments about your slimming may hurt your self-esteem, it may be because they have different views on your body image, or they think your body image does not meet their expectations.

Personal experience: If your relatives have experienced challenges related to weight loss, dieting and body shape change, they may be more likely to be dissatisfied with your slimming evaluation.

Whatever the reason, it needs to be seriously considered and dealt with. If you feel sad or uncomfortable, you can try to communicate with your relatives, understand their views and expectations, and find a mutually acceptable way to solve this problem. If it can't be solved, you can consider seeking professional help to deal with this situation.