I'm going to bail on someone who asked me to prom
Why would you bail on someone who asked you to prom?
I don't want to go to prom with her because she'll be a pain in the ass.
If you didn't want to go to prom with her, you shouldn't have agreed to go. You are committed to go unless you have a good excuse and her being a pain is not a good excuse. If she was such a pain, don't agree in the first place.
Fuck you. I'm just going to leave
You know that I am right. You made a commitment and you need to honor it.