We are all spiritual beings whether we are in tune with our higher state of awareness or not. When we hurt someone's feelings I believe we are in the same hurting ourselves to some degree. Many can relate to this by feeling bad after saying or doing something out of character. Some just blindly ignore it.
I for one can relate to this. I will feel bad after I say something that is not true about someone, which is why I tend to speak less and listen and watch more. We are all connected on a higher level of thought and existence, so when we hurt someone we are sending out a signal that we don't love oursleves and we deserve to be punished because of the act or thought we are sending (or have sent) out. It is an invisible boomerang that has to come back at us no matter what we do, good or bad.