Relationship problems?

So I'll go ahead and add this. I'm the type of guy to stay low, keep my opinion quiet, and just stay quiet. My girlfriend is the loud, blunt, and controling type of girl. So she wants me to stand up to my parents for saying something that in my eyes was just a rant and meaningless conversation. I agree with some things aren't good that was said but she went as far to insult both of my parents and say that if I didn't then it was over. I'm just confused and don't want conflict between my parents and her. I've been battling this for over 3 years and it still is going on.
Relationship problems?
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