I think it's partly because she thinks everything is an attack on her. If there's a plot twist, she doesn't like it because the creators are hiding stuff from her. If there's a redemption arc she doesn't like it because the creators are lying to her about the character being good.
This all feels very true. She gets quite upset when a story has a twist or asks you to recontextualize information you've already received. Maybe it feels like a betrayal, but just as likely (as speculated above) it makes her feel dumb for not seeing it coming.
I think back to her SU video and I realize that she only turned on the show after it was revealed that Rose was actually Pink Diamond, and she was livid that there were no clues, or the clues were so 'generic' as to be baseless, that it was a poorly-executed twist nobody could have seen coming and the writers were hacks. And I distinctly remember thinking that I, a person who had seen approximately four episodes of Steven Universe (and one of them was the April Fools Uncle Grandpa crossover) had figured out that Rose was probably Pink Diamond.
The whole video seemed to be working up to that point, and it was that point -- that Lily felt stupid and humiliated because she hadn't seen a twist in a kid's cartoon -- that broke her.
She was forced to reassess her assumptions about Rose, which had all been made on the surface level-- everybody loves her, everybody misses her, ergo she must have been an unequivocally good person with no grayness because literally everybody lionizes her even though it was pretty obvious from the flashbacks that Rose was
deeply flawed and the way the Gems talked about her with nothing but admiration was colored by their grief. Pretty sure Greg called her out on her behavior in one of those flashbacks. That wasn't a bit of 'bad writing' that put a flaw in a character who was supposed to be perfect,
Lily was just too stupid to realize what was being told her face. That somebody who everybody says is perfect was not, in fact, perfect. That somebody the show claimed to be the pinnacle of evil was actually not, in fact, evil. That the Crystal Gems didn't win their fight by murdering their enemy, but by their enemy turning against the Gem Empire because she realized how vile its ethos was.
Lily was told that the Goodest Guy on the Good Guy Team was actually what had become of the Bad Guy after she was confronted with moral dilemmas she had never needed to face before and questioned herself. It said that bad people are often misguided, that compassion and empathy can change hearts and minds, that you don't need to murder your enemies for peace. And Lily didn't like that.
Therefore, Rebecca Sugar is a Nazi sympathizer.
As mentioned, this is even more ridiculous because she did the same thing with Aliana in reverse-- introduced this badass bitch who easily dispatches enemies and kills without any questions because she's so certain of her righteousness, but also she's just a sad bean whose mommy died when she was a little baby eighteen-year-old child (later aged down to fourteen) who goes to her room and cries when that meanie head Leia says mean things about her. Don't you feel bad for Aliana now? Don't you understand why she's like this and that it's totally justified?!
If there's a cliffhanger, she hates it because the creators are manipulating her. If a conflict doesn't get resolved immediately, she hates it because the creators are wasting her times.
Seeing this also reminds me of when she said that serialized shows were just feeding people's addiction to drama to force them to keep coming back to see what happens next. The very
concept of tension is apparently 'addiction peddling' so in her own works she just doesn't even bother.
At least she's consistent but my god imagine misunderstanding basic story structure this badly.
I mean you could start at the end sort of and work your way backwards to show how this patient went to this psychiatrist for help to their death… but that would require talent and understanding of writing… Lily doesn’t have that
You
could do this, but it's clear that's nowhere in her purview because she talked about it totally incidentally. " How do I communicate this story is heavy? I'll kill a child at the start!" That's not a theme or plot point that's being woven with care into the narrative, it's literally just throwing in a child suicide to make the audience feel sad.
It also sounds like an Iris and Kiera story so good luck with how 'heavy' it's actually going to be. She couldn't even finish her vignette where the non-mute one got shot throwing herself in front of a racist bullet to save her girlfriend.
Then again she did write a 75k word fic about Anevay being repeatedly tortured and raped so maybe she's got the fire to finish this project if it abuses the women enough.