Why are along of girls purposely rude to me or cold when interacting with me?

I'm not much of a looker nor am I financially stable nor charming & I've noticed that when I interact with the opposite gender that they tend to get very cold & snobbish towards me on instinct

I've seen them treat others regardless of gender much better
Why are along of girls purposely rude to me or cold when interacting with me?
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