You should feel as comfortable with differences as you do with similarities, when it comes to horizontal feelings, like friendship or partnership. But vertical feelings, such as superiority or inferiority, should not be embraced. Here I would like to look at xenophobia.
Some people feel xenophobic.
This is a big misunderstanding and like all phobias, it is based on an unreasonable fear. In an extreme case someone might hurt another simply because they thought the other person might hurt them. . . This is the first thing you should avoid if you want to become an internationally-minded person. You should feel as comfortable with different people as you do with similar people. Let me give you an example.