He's been PMing me, too. Even asked me for my steam username.
I wasn't going to do anything with this but it's just getting pathetic. Basically he wanted me to reassure him that fluffies aren't horrible because I wrote a couple stories for the booru. I've already said my piece on that place, but I basically told him, "Fluffies are horrible and you shouldn't expect anybody to understand." Then the above happened. I haven't replied yet and I don't think I will.
I have a feeling he thinks he's someone important in Kiwi Farms and people will be sad if he leaves. I didn't even know he existed until yesterday.
They're largely populated by newfags from 4chan and they like their memes. That's my best guess.