I'm going to tell my girlfriend she's not beautiful
Why are you going to tell your girlfriend something mean?
Apparently she's drunk and she asked me to tell her a compliment.
If your girlfriend asks you for a compliment, you should give her a genuine compliment. Telling her something hurtful will make her feel bad and you will regret being so mean to her.
She's a bitch and I'll talk to her how I want.
You should compliment your girlfriend to make her feel good. That's why you two are partners after all.