1. Don’t try to justify or overexplain yourself
Have you ever felt gaslighted? This is one major thing narcissists make their partners feel like. By simply using sarcasm and a neutral tone and posturing like you have to overexplain yourself for doing something completely normal, they manipulate very well. But you must know something: nothing on this Earth deserves justification.
You are not required to justify your beliefs or feelings. The more you do, the greater the danger of them using gaslighting to make you feel insecure.
It is useless to defend oneself against narcissists because they will prioritize winning over cooperating and self-promotion over communication.