@Cloverfr She might have felt bad, but she didn't really do anything to save an innocent person, one who allegedly was her sister, now did she? Rather a poor excuse for a heroine, and it doesn't change the fact that she was selfish (nothing wrong with that, she looked out for her own interests, just like any of us would), but it doesn't give the reader much of a reason to like her, does it?
I agree some people go overboard with the hate and insults (especially since she hasn't done anything truly bad or with malicious intent towards Athy), but she has become an eyesore and has done nothing to help her sister. She enjoys having fun with her father, while having the princess as a playmate in her house (her reaction when she found out she was no longer the only person who knew Athy's secret is very telling of her true nature), she wants things to go her way, and just because she's all smiles, watery eyes and confused stares doesn't make her blameless.
Are the insult towards Jeanette too much? Yes, but it doesn't bother me because I don't care for the character (she brings nothing to the story, nor Athy's arc, Jeanette is not her ally).
Do I blame the ones saying it? No, I blame the manga storyboard writers who have prolonged this arc and caused discontent towards a, yes innocent secondary character, but otherwise irrelevant person who should not be the focus of a story causing it to drag on (and straying from the novel). The focus should be Athy and her journey, plus her relationship with the others.
The Jeanette and former dead/not dead emperor (aka her dark magic daddy) centric arc is stale, boring and repetitive. Nothing is happening in the story. It is worst than Dragon Ball z, where it takes 50 episodes for them to defeat an opponent's first form and still have 2 more transformations to go.