Self-righteousness is unavoidable. You can either be a self-righteous Pharisee where you think you are better than everyone else or you can be a self-righteous pagan who thinks you are better than the Pharisee. If you are a self-righteous person, I could become very self-righteous thinking that you're self-righteous and you think you're so good but I know you're bad. I know I'm bad so that makes me better than you.