For a long time, the world of fantasy, sci-fi and young adult books was largely populated by young boy protagonists. That's shifted, thankfully, though there is still a dearth of diversity. But the shift in the gender gap has highlighted how bias in the real world has crossed over to how people experience made-up ones.
Author and editor Danielle Binks brought the issue up on Twitter. She works primarily in Young Adult, and has said she has noticed that in negative reviews, readers don't say they didn't enjoy the story structure or found the prose boring. They often just say how stupid and bad the female protagonist is: