I'm gonna make this guy's life a living hell.
Why are you going to bully him?
I don't like his attitude when he is around me.
Harassing others is always wrong, even if you think people have a poor attitude. Refrain from messing with this guy or he will push back on you.
I don't care what happens. I really want to bully him and make this the worst day in his life.
You still shouldn't do this. You are the one being a jerk here.