I am going to scream at my girlfriend to apologize to my mom after yelling at her because she was being an asshole.
What was your mom's reaction like when she yelled at her?
My girlfriend was being a bitch and my mom was flabbergasted.
Even if your gf was in the wrong for yelling at your mom, you screaming back at her to apologize is just as bad. Screaming and yelling leads to more conflict and resolves nothing.
Nah. I'm going to be the victim here. I shouldn't have to apologize to her.
That is where I think that you are wrong though. If you yell at anyone, it is always a good idea to apologize so that you can clear the air.