TL;DR: reader of a mature magazine blamed my short story for downfall of an entire genre; genre is alive and kicking
In my youth, I somehow (read: the mate of a mate of a mate...) managed to get a spot for a series of short stories in a small... magazine geared toward male adult readers. It paid.
The magazine eventually went under as people started getting their pictures elsewhere.
There was a section on the last page for readers to send questions and feedback. Terrible idea if you ask me.
My series of short stories, let us call it "Rendezvous", had to be very short since I only got two columns. These columns were less than 1/3 of the page's width since there were always pictures of a beautiful women next to them.
In theory, Rendezvous had nothing to do with the pictures, but they were placed thusly for a reason.
Long story short, one reader already well-known for sending "constructive" feedback with every issue took a liking to Rendezvous and initially suggested the stories should be longer. Then he demanded that Rendezvous should be one continuous story about the protagonist in my second short story. After all, only that man had depth and all my other characters were too talkative.
Well, that I could still consider constructive feedback.
After a year, the short stories, including Rendezvous, got axed in favor of more pictures. Not just mine, all of them. It was an editorial decision. I was not too upset since the amount I earned was not large and my financial situation had begun to improve a little.
That reader did not seem to agree. He sent a phenomenally loquacious three-page letter rant blaming Rendezvous and one other story for "the downfall" of mature literature. He then spent two pages making unfavorable comments about the editors of the magazine as well as yours truly. Lastly, he graciously offered to continue reading the magazine if they brought back the stories.
Needless to say, that letter did not get printed.