In all seriousness, re: C#3.
It is abundantly obvious at this point that he is a sad, angry guy. My guess is that he probably has one or several handicaps of some sort which keep him from interacting with the rest of society in any significant way, and has probably caused him to be subjected to some cruelties in his life that have helped shape the personality we see here.
Continued ragging on him, responding to his posts and letting him upset you is precisely what he wants. It gives him a life, after a fashion. Now, if you wanna perform a charitable act and continue to respond to his baiting, go for it, he’ll appreciate it. But if he truly annoys you and you’d like to be as little bothered by him as possible,t he best course of action is to sompletely ignore him. Don’t acknowledge anything he says or does. If he can’t get a reaction, he’ll go away eventually because there’s no payoff.