Look for qualities to appreciate in others. What you see in them is a reflection of what you are in yourself. The more you appreciate others the more they will return that feeling, like the strings of a musical instrument which vibrate in sympathy with kindred notes elsewhere. But if you see qualities in others that you dislike your negative reaction will be a sign that you have the same unattractive qualities in yourself. Use your negative opinions of others in this case as goads for self transformation.