Some of us tend to do just the opposite. We sift through the diamonds searching for dirt. Strong families don't dwell on faults, they look for the good in people, and they find it. Strong families condition themselves to look at what they have and what they have completed rather than what they lack, what isn't done and what we can't be. If we don't feel good about ourselves, it is difficult to feel good about others.
Parents often wonder why their young teen is constantly cutting down others in school.
Looking deeper you may find they are feeling bad about themselves, perhaps compensating for skin problems or a clumsy growth phase. Teach them subtly how to show regard for others by showing appreciation for them. Remember that people who have never felt the joy of being held in esteem are in no way capable of appreciating others. We've all had it happen. I hate it.