You taking revenge will change nothing. Putting him in your place, even if it were possible, will not make him a better person. Someday he will learn that his actions are not beneficial to him. One day, he will wake up and realize nobody likes him because if what he's said to them, no one wants to be his friend because of the way he's treated them, and the people he has hurt will either be stronger and immune to him or have broken them down so much even he won't take pleasure from their misery. He will, one day, have to make the choice of whether this is the life he wants, or if he wants his life to change.
If you attempt to give him what he deserves, then you will only bring more anger and hate into the world and make things worse. You will either regret your decision at some point, or you will become just like him in the process, accomplishing nothing. I'm not advocating pacificism, few can just lie down and take a beating. You may defend yourself, but you must never take the offensive or else you will become his bully. Then he will redirect his anger and misery onto other people, because that's what a bully is. And so the cycle of suffering will continue until it is broken, by you.
I have a sibling who I haven't gotten along with in years, she berates and bullies me constantly no matter what I do and I can barely stand to be in the same room as her. I have given up all hope of ever having a relationship with her and I dream of the day I will leave home and never have to see her again. But no matter what, I have never and will never raise a hand against my sister. I have suffered so much under her, but not even she deserves to hurt as much as she has made me. The only reason she works so hard to make me feel horrible is because she feels horrible too, I will not do unto her what she has done to me because neither of us will benefit. The pain she's inflicted will not go away and she will not learn her lesson any faster. I don't like my own advice any more than you do, but I will follow it and pray that you do as well because we must rise above the pit our bullies have dug for themselves. And when they realize they can't climb out of it, we will be the ones to offer them help, because family is still family.