According to the sociometer theory, we can judge how good someone's interpersonal skills by looking at their self-esteem. This theory believe that people with high self-esteem tend to have good interpersonal skills. So we use sociometer theory to judge/evaluate other people
According to Concept of appraisal, people tend to think of themselves based <em>on what they think</em> on how other people judge them. So we use concept of reflected appraisal to judge/evaluate ourselves, not other people.