Why do guys insult you after you reject them?

honestly this guy I was talking to pursued me hard even though I barely relied to his texts, he finally asked me out and I said “I’m not really thinking we’d get along well in person, I seen this texting stuff as more of a friendship” and he asked me why... I said it’s just how it is he then calls me a racist bc he’s black and I rejected him
i then ask him to stop texting me as I’m just not looking to date. then he said “You ugly bitch remember what colour you are you racist and then also fix your makeup and lose weight “
coming for my weight was a shocker I’m literally 5’6.5 and 126lbs he’s acting like I’m a whale
Why do guys insult you after you reject them?
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