Helping your child understand personality differences will help them value their own uniqueness and appreciate others as well. They will feel more secure knowing that it is natural to like some people more than others. You can help them become open to learning from many types of people by helping them understand a little about personality traits. This can be done in a very natural way as circumstances & situations present themselves, or you can have some fun studying your own family members personality traits together.
Resources for Personality Traits:
The 4 Temperament Types