I agree! Additionally, they tend to simplify things. They see the poor child with great talent who was enslaved and abused but do not see the rich, powerful adult who doesn't appreciate any of his achivements and actively wants to make everyone else miserable, to the point at least two disciples before Binghe left Qing Jing Peak because of his treatment and peaked in him trying to murder a young child, his new disciple, because he's talented and had a mother.
He did not care Binghe lived in poverty his entire life. He didn't care his mother died a miserable death and he's an orphan now.
It's the same with Liu Qingge. Shen Jiu hates him for three reasons:
For having living parents.
For coming from a rich household.
It's said in the extras that ANY of these would make Shen Jiu despise someone.
He does NOT actually care all that much about background or personality or behaviour. He just assumes that someone has had a better life than him and therefore doesn't deserve to be happy or successful. Reminder: his definition of better life includes "has a parent". Completely ignoring, once again, that he is now one of the richest and most powerful people in the world and thousands WISH they were him and they will never be.
Shen Jiu clings to hate, bitterness and violence as coping mechanisms despite the fact that those cause qi deviations. He is walking a path of self destruction.
This is what abuse can turn people into and it does not make them any less victims of abuse.
Shen Jiu deserves happiness?
The concept of having to earn happiness (through suffering or otherwise) is already fucked up on its own.
The fact that most of Shen Jiu's personality and actions get erased by the people saying that is just proof that no, they do not think he deserves happiness. Because Shen Jiu is not the perfect victim they want him to be.
Nothing is going to simply make him happy! He needs to WANT to be happy, he needs to WANT to HEAL! And that's not something you can force on someone. It's something they need to want on their own! He needs to decide that he does not want to live with resentment and bitterness anymore. He needs to decide that happiness is something he wants!
But that's not simple. It's not black and white. It takes time.
So they simplify it. That and purity culture.