I was called ugly by a man that was a complete stranger in the past, why?

One time I was at Walmart shopping by the clothes section and a man stopped at kept calling me ugly to my face and this happened a few years ago.. What have caused this person to say such things to me? Was there something horribly wrong with my appearance or what caused that to happened?
I was called ugly by a man that was a complete stranger in the past, why?
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