Catch him in lies and make them feel stupid in front of others. Make him and everyone else question his Ni or his logic. Attack there weakness, but dont tell them I told you so. Really though, revenge is not worth it in the long run, but when was this ever a perfect world
THAT WORKS. I met a narcissist ESTP once who was really into me. The only important weak point I could touch was that he was an orphan.
He was a professional liar focused on his own business and only that business. Believe me, that man (maybe all ESTP) feared a lot humiliation.
He really did crazy things for me, but was totally unable to be humble and let drop his mask. He was also very immature (one more on my list, not only ESTP !)
When I told him it is over, he didn't want to hear it (like most men


). A week ago, he had DECIDED to buy stuffs for me.
I got rid of him by just expressing myself frankly and inviting a new story (he would not have left me alone if I was telling him I was free) :
"I'm not a prostitute ! you'll not buy me with your goods and your material promise. I'm not attracted by you. You disgust me.
I've found a man who listens to his heart and isn't obsessed with money. And that man doesn't consider me like his dog. Understand ?
Do you wanna hear more ? "
He said no (laughing of course, obviously that was so so funny, isn't it

)
He had too many scares underneath to accept me to humiliate him. And I knew it.
I stopped seeing him but every time he used to be back with some pictures to remind me "the old times" and some invites for a vip restaurant
(I seriously prefer to eat to mc Donald with a guy I love than with a man in a 5 star hotel who takes me for his doll !).
I refused firmly. He was back like....15 times . He was NOT IN LOVE and HAS NEVER BEEN (to my senses).
He loved the way men were looking at me when we were together and I knew it. I hate that feeling. I was a kind of trophée he wanted to exhibit.
I was frank enough (and I'm still being), rebellious and very ironic for this kind of "man". I was always angry with him. He didn't seem to care much.
You must SHOW HIM YOU DON'T FEAR HIS STUPIDITY. A secure and healthy woman must know her limits and fight for her rights.
If you still feel attracted to him you may have a problem to solve with men (BAD ANIMUS).
Normally his first weak point should be his "social image".