Why do some people don't like you for no reason at all?

I started taking some extra classes for school and first day I was really polite and social to everyone. As the days went by I became friends with this guy and he said that a girl that appears to be friendly to me doesn't like me at all. Why would that be? Like why would she hate me for no reason?
Why do some people don't like you for no reason at all?
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