I want to hurt my sister's feelings.
That's bad. Why do you want to hurt her feelings?
She's a sissy's bitch and she's a pushover schoolgirl.
It doesn't make sense that you want to hurt your siblings feelings. You spend so much time wanting to hurt her and you should just go about living your life.
So I should ignore her.
Yeah you should ignore it, if you cannot be kind to her. It would be better than to make her feel bad on purpose.