Lots of us mess with other people.  Does that make us a bully?  No, not usually.  It only makes us a bully if we do it consistently, target our "victim" and keep on doing what we do to make someone else feel bad, scared, insecure, or constantly "on watch".  We all have moments when we want to hurt someone else, help someone else feel scared, overwhelmed, or in awe of us.  The main point is if we act on that feeling, if we use that feeling to get others to do something, give something, or be someone that we WANT them to be.