If you call out a narcissist on their abusive behavior, they will usually become very angry. Their anger might be expressed in rage or in more covert means such as the silent treatment or gaslighting you. They don’t like to be held accountable for the things they do to others, because that means they have to admit they are less than perfect. It also means they have to acknowledge the humanity of someone else, which they aren’t capable of doing. Narcissists are all too aware of their imperfections, but only at the subconscious level, and the way they handle this is to project their own imperfections onto you. So a narcissist might tell you that YOU are the narcissistic one, or that YOU are the abuser. They’re also good at getting others to side against you, and those people become their flying monkeys. They will accuse you of doing things that they themselves have done and everyone believes them and not you.
You start to feel like you’re living in a hellish world of smoke and mirrors, where you’re no longer sure what’s real and what isn’t. The narcissist has, unconsciously or consciously, set up this elaborate lie as a massive defense mechanism against being exposed as imperfect and flawed just like everyone else, because being forced to acknowledge their shortcomings is to expose their vulnerabilities, and being vulnerable is incredibly terrifying to them. They blame so they don’t have to feel shame.