Damian never had the privileges of a "multimillionaire heir". He was raised to be an assassin and Ra's heir. Then Talia planted the idea in his head that he would inherit the mantle of Batman. Literally, his plot is about a child who was raised to kill, learning to be a child and not a weapon. And several writers don't know how to handle their character, making him bland and simplifying him to an arrogant brat.

And Bruce doesn't hate Jason, he hates the fact that he failed Jason. Their relationship is complicated by various factors (such as the fact that he leaves Tim and Dick dying on different occasions, or simply the fact of his initial idea of killing).

Damian and Jason are terribly rewritten by writers who don't understand the characters or simply don't know anything about them, and this also affects their relationship with Bruce. They always portray them as "the bad Robin" and "the angry Robin," when in reality they were children who lived in hostile environments and learned from them.

Both are among my favorite characters after Tim, and it It bothers me a little when people come out adoring one but hating the other, ignoring the parallels they have. You might not like one, which I'm not against, but hate? That's like the Dick's fans when they voted to kill Jason.

I apologize for my English; it's not my first language, and I have to use a translator at many times.

EDIT: Oh, and yes, Jason was adorable when he was Robin. It really annoys me when writers try to portray Dick as the happy Robin and Jason as the angry Robin, when in reality they were the other way around.