Have you ever really disliked someone just because you did not like the look of their face?

I can remember when i was quite young and there was this guy at school in the same class as me. There was something about his face I didn't like. Every day after school I made sure I caught up with him on the way home and proceeded to punch him in the stomach until he cried. I am not a bully and cannot understand why this happened and yes I know that will be regarded as bullying. Anyway, one day as I was following him and was about to start the old punch in the tummy routine and a car pulled up and his Mother came out and caught me. Needless to say i didn't do it again and it was me crying. Have always felt bad about doing it but why I wonder, just because I didn't like his face?