I don’t like the way my girlfriend is talking to me

I have a hard time with my girlfriend.
She often speaks loud and screams when we have a conversation or tells me “What you are saying is nonsense.”
I feel disrespected thinking “She does not know how to communicate.”
I want to have a peaceful relationship. I do love her but I am feeling angry when she does this.
I end up trying to justify myself and then saying “OK, you are right” to calm down the situation.
I don’t know what to do to face her reactions?