Man gets angry after being denied?

I talked to this guy from a dating site only once over the phone. After talking to him I really wasn’t interested and I told him instead of just ghosting. He was pissed and called me a cunt. Now I’m a red flag lol. This man won’t stop calling or texting me. I haven’t responded to any of his calls or messages. Am I in the wrong?
Man gets angry after being denied?
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