This is what you said.
"Those who can't write, write fiction."
Now you're trying to spin it into criticisms of specific authors. Sorry, but that's not what you said. You said, effectively, only bad writers write fiction, which implies all fiction is bad. I happen to also have no interest at all in reading Les Mis and I can't stand to read Dickens. I've been halfway through Great Expectations for ten years. Not a huge Shakespeare guy either. But that's all a result of my personal tastes, not the talent of the authors.
It's just not the case that "those who can't write, write fiction." It's lunacy. It's dismissing all novels, all plays, all poems as worthless. Maybe it's easier to write a shitty novel than to write a shitty biography, but that's not your claim. You're damning the entirety of literature. For once, I look forward to the tome obiwanobiwan writes in high dudgeon.