My girlfriend is disrespectful and condescending. Does she even love me?

I’m sort of at a loss here, and I can’t seem to understand how and why girls can be so disrespectful and straight out hurtful during arguments.
She doesn’t stick to the point but rather brings up thousands of non related metaphors to strengthen her “point”. which seems to me like just a way of being mean, especially when it’s always directed at me.
don’t get me wrong, i would completely understand if i had done something major like cheating but that’s not the case. Usually it’s something very minor that she blows out of proportion, and uses that energy to spew out the most disgusting words i have ever heard.
i just can’t understand how anyone can treat other people like that, even if it were your sworn enemy.
I’ve started wondering if I’m dating a psychopath...
Has anyone else experienced something similar? If so i would be glad to hear your take on this.
Updates
+1 y
Update. Tonight she started crying and yelling telling me that i am mean for the mere reason of asking her why she thinks loaf/white bread tastes better than whole wheat bread... I mean wtf... she couldn’t even explain why she thinks it tastes better. But i don’t care about that, I’m just frustrated that we can’t have different opinions without bickering and moaning about stupid shit all the time.
IT’S A FNNN BREAD!!!
Sorry that i had to unleash my anger here guys and girls.
My girlfriend is disrespectful and condescending. Does she even love me?
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