That's his point. If someone is stealing your car you are supposed to just call the police and watch them drive away? Try to stop them and you are the criminal. You break into someone else's car and you deserve the beat down coming. Probably better off not calling the police in some places.The actions that have been reported and described would probably be defined as retaliation, not self-defense.
If someone is coming after you? Drop that motherfucker. A bitch push? Well.. if you drop him, that's probably on you.
If there's more to it than what I have read, my bad.. but certainly didn't sound like self defense to me.