I had a very toxic and narcissistic "manager" in my past role. He joined as a senior although other people including me had more experience than him; and soon after, due to lack of enough surveillance, he gave himself the title of manager. (Not exaggerating. The team was small and the company was midsized. This person directly convinced the CEO saying how important he is for the team and then went to the HR and promoted himself). This person threw a lot of jargons and did even more flattery, did nothing on his own because he lacked the skill, delegated literally everything and asked for help to do even the smallest tasks only to put himself in the focus when the stakeholder meetings happened. Also was so narcissistic that he could never see his fault even when team members directly complained to him and vented their frustrations. The reply was "I don't understand why they were mad with me; I would like to think I did my best to be a better manager." I guess the flattery and smooth-talking served only himself and no one else and many would say that he did whatever was needed to climb the stairs.
However, I was the person he took most advantage of since I was the most reliable person who had to clean up or step in everything he messed up. In return, he recruited a fresher who hung out with him before joining, in a senior role which was mine to get. He told me I have a long way to go to be a senior. I sucked it up and carried on. He got fired soon after a change in the leadership. I left the company sometime later. Since then he had been bothering me on personal messages, LinkedIn and what not. In the beginning after I tried in vain to ignore his repeated messages and calls, he was practically begging to connect with him so that he can discuss how I am doing in job search, only to talk about how hard it has been for him to find a job and if I can help him with explaining the projects that "he worked on" so that he can explain it better to his recruiters. I refused and he went for a while. Then again came back after few months with a proposition of collaboration (he said we can collaborate where I could teach him my tools of the trade). I told him very respectfully he should ask the people who have been benefited from his support for help. He did not get the hint. Then again after few months, he started nagging me on LinkedIn to ask why we are not connected, and if we had a falling out. I can not believe the audacity and the stupidity. Is it worth letting him know why he is being ignored or should I continue ignoring? I'm afraid his narcissistic brain will not understand why he has been shunned.
UPDATE: Blocked this bloke everywhere. Hope this goes away.