Is this considered a threat?

There was a conversation between my boss and I where my boss called me “mentally ill” and blamed me for some issues going on at work. I told my boss that I was going to report him for what he said to me. My boss then left me a voicemail saying, “Are you sure you want to go down this road? You better watch your back and make sure you have all your facts in order”

The next morning, I walked into the office and my boss stopped me at the doorway and said that there was something wrong with me and that I was mentally insane, and he said “you don’t know who you’re messing with”.
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I’m not sure who to report this to because my boss owns the company I (used to) work at.

Would this be considered a threat? Verbal assault?

I would like to press charges, but my state laws are weird.
Is this considered a threat?
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