It was a story in which his ponysona was a pedophile and very explicitly raped a small foal, which Knighty's mods wouldn't take down until after it had served its purpose.
Yes, RH Junior is absolutely an obnoxious, pretentious, Bible-thumping asshole with absolutely zero people skills. He draws furry webcomics, if you didn't know. Absolutely he is difficult to deal with on his very best day. That's true. From what I observed of his online behavior, including some very brief conversations I tried to have with him, I suspect that he's an angry friendless spergy loner, possibly living in Mom's basement and working some nightmarish retail wageslave job and saving up money to buy a new fursuit, in which he may read from the Bible angrily at people walking by on Sunday mornings, wearing a "REPENT" sandwich board over his fursuit.
But we need to remember that he is far from the only the only insufferable autistic vitriolic asshole NEET or NEET-adjacent who writes horsewords. That status is actually not uncommon in the fandom, including among the content creators. But he was an irresistible combination of badthinker and someone with few people willing to go to bat for him and defend him. The SJWs at FIMfiction got away scot-free with harassing him and driving him off, and were ENORMOUSLY embolded by their success. How many real pedos have been outed in the fandom, and how many of them got fawned over and still get fawned over by the same people who still gloat about "getting rid of that Nazi motherfucker?" Look at Purple Tinker. Look at Wootmaster. Is RH Junior really worse?
I don't think he deserved to get singled out and dogpiled by Soyboy Justice Warriors. I don't think he deserved the treatment he got, not when some people in the fandom are still treating Purple Tinker like a rockstar. I hate to sound like a little kid, but I think what happened to him was unfair. And if Knighty had taken a little bit of responsibility and reined in his mods, if he'd made an example of the person who wrote the pedo story with RH Junior's fursona, I think FIMfiction wouldn't be the SJW dumpster fire it has been allowed to become.
Among other things, RJ Junior was the first badthinker to get that treatment. He wasn't the last. He wasn't the only one to abandon FIMfiction as a result of harassment. There are others with whom I've corresponded who've given up on horsewords altogether over such treatment, but–well, I won't betray their trust in me by naming them. But if you see a half-completed story by someone who last logged on in 2018, who perhaps dared to question Antifa or BLM in a blog post shortly before disappearing… you just might have found one of them.