What do you think of me nailing a special needs girl square in the face with a heavy muffin on the last day of high school?
That sounds horrible. Why did you throw a muffin at her?
I'll see to it that she will learn that she can't just copy me 24/7 without my permission
That was not very nice behavior. This girl with special needs might not have realized that she was being annoying by copying you, and throwing things at people regardless of their mental state is wrong.
She's annoying, can you stop? I don't want the help now. Seriously.
It's wrong to hurt someone with special needs just because they were coping you. It's possible that she looked up to you and instead of showing her respect, you chose to embarrass and degrade her.