I needed to see this quote today as this is just what I am doing. You can’t win an argument with a narcissist as they don’t feel empathy. There is no reasoning. They don’t care what horrendous words they have said and how it has deeply hurt you. They don’t realise the great job you have done raising their children, while they are frankly useless. They big themselves up and truly believe their own lies. They also make their children believe them too. You are always the weak person the underdog.
Walk away leave them to their own lies. They aren’t worth another moment of your energy and time. You will be much happier. You know the truth and don’t need the negativity anymore. Until you do that you will never be happy.