The best thing you can do is ignore him. He's a narcissist - a reaction is what they want. They don't care whether it's negative or positive - as long as they get *something* from you, they will consider it a win and keep engaging. The only way to "win" is to completely starve them - aka, block them without responding.
Sorry you have to deal with this kind of nonsense. Perhaps this person will find some peace one day.
I'm currently gathering evidence of all their continued harassment over several usernames and I will present it to itch.io in order to have them banned from the site indefinitely. I encourage you to take screenshots of all of his antics and do the same.
Suspended account38 days ago
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oh hey lying because you got roasted and exposed for lying about your religion?
Suspended account38 days ago
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but you can get banned for false accusations and spreading misinformation
Suspended account38 days ago
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and I can get you arrested for s saying I'm harassing someone when I'm not