My girlfriend got white knighted, why can people not mind their own business and was I wrong?

I called my girlfriend a bitch. I didn’t say it loudly but I was obviously joking. Even my girlfriend told him to chill the fuck out.

I was obviously joking. That’s just how we are and by the tone of my voice I obviously didn’t mean it. We poke fun at each other but we don’t really mean it.

This dude just wouldn’t leave us alone and kept harassing us. Even after my girlfriend said she appreciates his concern but that we were just joking and it’s just how we are.

He kept yelling at me until it almost got physical and she told him to just chill the fuck out

My girlfriend got white knighted, why can people not mind their own business and was I wrong?
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