Years ago, I had a female manager, who I knew to be a brown belt in judo, threaten to beat the crap out of me. She said this half jokingly. I think she was on a power trip and wanted to see if she could intimidate me
My response to her was that I would treat a female martial artist who initiated violence exactly the same as I would treat a man who initiated violence against me -- namely that I would pick up the nearest chair and smash it across her face.
She was somewhat taken aback, and did not threaten me again
If she was joking around, like you said, I think it was rather crude of you to tell her you were going to smash a chair across her face. You were the one who was being threatening in that situation, not her.