My girlfriend insulted my mother so I threw a drink her face. Was I wrong?

Anonymous
We had a disagreement and things got heated. I guess things got so heated that she insulted my mother. I told her that she could insult me, the amount of money I make, my manhood etc. But under no circumstances was I going to tolerate her insulting my family, especially my mother who I love dearly. We were out for dinner and I asked the waitress to bring the bill so I could pay for my share and leave as I was disgusted. I then threw my drink in her face. I realize that was disgusting behaviour but do you think it was justified?
My girlfriend insulted my mother so I threw a drink her face. Was I wrong?
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