Is he justified in reacting so harshly?

My male co-worker has made a pass at me even though he knows I'm married. I rejected him. He was offended to the point of ignoring me at work.
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He always says things like he wants to have sex with me. He whistles after me and touched my ass the other day. I said I wanted distance from him. Let's not talk for a while. Then he started swearing. He not only ignores me, but he works in an abusive manner and doesn't even say hello.
Is he justified in reacting so harshly?
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