I'm going to call out my friend's girlfriend on her bullshit and then drop that very same friend
You can't be serious doing this. Why do you have a problem with your friend's girlfriend?
She's very fake and a show-off.
I don't think it's wise to call out your friend's girlfriend and then stop being friends with him. If you don't like a friend's significant other you should keep it to yourself because saying something will only cause tension. If you don't like her then just avoid her.
It's easy for you to say that but I need to stand up for myself.
I'm proud that you can stand your ground, but is that girlfriend really someone to jeopardize your relationship with? Your friend might need you in thick or thin, how would they feel if you left them because of their choices?