Heads Up

Do you ever have a strong negative emotional reaction to someone? You notice an immediate gut feeling that you definitely don't like that person. I'm not talking about someone who is menacing or threatening. I'm writing of a person you have no reason to not like but you don't. This person may be a celebrity you have never met, someone in the grocery store, someone at work or perhaps a family member. Take notice. My powerful reaction is a guide for me to allow the emotion and then look at what that person is mirroring to me. What in myself is that person showing me? Why do I feel that way about them? 
What do you do?