The bottom line is that no matter what our beliefs are, they are often based largely on interpretations handed to us by others. Sometimes those beliefs resonate with our own internal truth, and sometimes they don't. Regrettably, we often hold beliefs that we ourselves don't believe at our core.
When we encounter someone, usually the mind automatically slots the person into a category: man, woman, your friend Tom, the kid next door, etc. Watch this happen in your own mind as you meet or talk with a co-worker, salesclerk or family member.