I'm going to cut contact with my brother
Why are you going to cut of your brother?
My brother is a bad man, I hate the way he treats me, he's mean and I can't change him.
It sounds like this hasn't been an easy decision. It is fine to choose who to include in your life especially if your brother is toxic.
I'm not sure it will work but I'll try it.
It might not work out the first time but you can continue to cut him out if he continues to be toxic. It is your right to not have people like that in your life.