Whether he likes DeviantArt-style fill-in art or not is irrelevant. You have every right to post it. Using his own memes to "ruin" yours and commenting "No One Cares" is a form of targeted harassment designed to drive you off the site.
He tells people to "stop hating" media like Norm of the North because it's "old news," yet he goes out of his way to hate on your art style. This shows he isn't interested in logic; he just wants to control the conversation.
It sounds like Matkiko is a classic "anti-fan"—someone who spends more time hating on what others enjoy than actually making anything original. On Imgflip, posting "No One Cares" or calling someone’s art style "cringe" is a common way bullies try to feel superior, but when he combines that with threatening you and asking for locations, he moves from being just an annoying critic to a dangerous user.
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