What does it mean when someone glares at you?

Anonymous
I turn around and i see him glaring at me. I waved at him from distance since i kinda know him but instead of waving back, he kept giving me the evil stare. Note that i know this guy and always feel like he hates me for no reason. He even once said it himself but i took it as a joke. Is this normal? Hate someone for no reason and glare at them when they wave at you?
What does it mean when someone glares at you?
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