My greatest challenge is to stay away from labels. Many people today seem to focus on labels when interacting with others. They want to quickly determine if one is conservative or liberal, Christian or Moslem, etc. Once a label is applied, assumptions are made about the individual without any consideration for the many factors that determine who a person is, and how they view the world.
In terms of relationships, it is the same as attending school and never going to class or reading a book. Just as it is impossible to learn if you assume you know all there is to know, it is impossible to understand other people if you assume you already know who they are.