real. i also feel like its people heavily projecting their experiences with their own parents to these characters. yeah people are free to project and shit, but sometimes it gets to a point. not everyone had shitty parents like you (general) and acting like every parent character who doesnt live up to your standards and expectations of what a "perfect parent" should be like is fucking annoying.
I think some people don't understand that it's not always about nuance or even misunderstanding the characters, themes, etc - it's about what makes an entertaining and satisfying story. And for a lot of people, fanworks, meta, playing with dolls etc, involving dark things like abuse is exactly that. A person can understand that the characterization is OOC and still write a fanfic around it.