I'm going to lie to my disabled classmate to get away from her birthday party.
Why would you lie to her?
I heard my classmate is a whore, I don't want her near me.
You don't have to be friends with all your classmates but you shouldn't lie. It is okay to be honest about not wanting to go. Just be nice about turning down the invitation, you don't want people to think you are mean.
I don't care what people think. I will be gone once I finish school. I need to ruin school life for the disabled.
That does not seem to be a worthy goal. Neither is lying to them. It would be good to tell the truth so that there are no misunderstandings.