Yes indifference hurts and angers the narcissist because it shows them that they no longer have power or control over you.
However in my work I have found what often hurts them more is exposing their behaviour to the world (as long as you do not put your-self in danger).
An example might be to immediately call the police or a friend when they start to become coersively or physically controlling. This is a crime. Why keep it hidden?
Too often we hide their behaviour as if we have something to be ashamed about. Or if they blatantly lie about you as a put down in company, call them out on it in front of people, without being too invested in their response.
Exposure in my view hurts a narcissist just as much as indifference and in doing so you grow in strength and self-validation..
Do not let them shame you into silence for their unacceptable behaviour, this shows you are truly indifferent.
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