it's kinda ironic in a messed up way if bell's hells fans and araman fans are now like "aw man jester is the worst, she hates all other women" because most jester hate i see is from men who are like "jester is an asshole that only cares about herself and never gets punished because she's a WOMAN! if she was a MAN everyone would hate her and want her to get rightfully punished!"
Honestly I don't think C3 or C4 fans are largely to blame for any hatred Jester or any C2 characters get as someone who is enjoying C4 and really didn't engage much with C3. It could be just my lack of knowledge, but as someone very present for the great fandom meltdown of 2020 following 118, Mighty nein fans are often our own worst enemies and biggest critics. It got so bad that the discourse breached containment and we had non-fans weighing in with incredibly misinformed and biased opinions on the characters and I genuinely don't know if any other critical role discourse has ever reached that insane level of causing Matt to have to go online and actually tell the fandom to stop.
I'm sure some fans of the other campaigns have uninformed/bad opinions and maybe they enjoy taking digs at C2 because they simply want to incite anger and Vitriol towards a campaign that often has some pretty hostile defenders who themselves regularly insult other campaigns, but ultimately I think putting the blame on them for any of the C2 characters getting hatred is a bad way to go and I am unwilling to do it.
Now: For the criticisms themselves. I've heard "if she were a man" about things very often in fandom and it's almost always a guy saying it, it always comes off as something done to try and push back against claims of sexism or to bring out this idea that somehow women get more leniency in fandoms when that simply isn't the case. Women will get hated for doing things male characters do all the time that fandom love, they'll get hated for being in the way of ships and in general just be on the receiving end of a lot of violent misogyny where fans derive pleasure from putting them through torture and suffering. Men on the flip side only tend to get hated on when they're in the way of shipping. They can act however they want and most fandoms don't care. (Compare people hating Fjord/Aang/Sun from Rw//by to people who hate Beauregard/korra/sakura from nar/uto and you'll see big differences in why fandoms hav issues with them.)
Fans who call out male characters for harrassing women 9/10 times come down just as hard on women when they do it, because they don't want to see characters harrassed at all. "If she were a man" is most often a strawman argument.
I think us having conversations about how Jester's early behavior pushed Fjord's boundaries are important. She learns and grows out of it. But ultimately she did at times touch him without consent (specifically his chest or abdomen) and would flirt in ways that came on strong that he wasn't into. But when she realized that what she was doing wasn't working like she expected, because she'd been raised to believe that's how you act when you try to woo, she stopped. She took a step back and did her best to not make him uncomfortable around her. To be a safe place for him to feel able to be emotionally vulnerable and that's what ultimately led to him catching feelings.
As for the "She's selfish" those are reads by people who don't care to understand her and are likely just hating because people love her. Yes There are times when she goes over someones head and tries to help them with a problem in spite of their protests. Because she wants to be helpful and heal hurt and fix things even if she should leave it alone. Any desire people have to see her punished for it is them projecting, the nein don't scream at jester or act cruel to her when she messes up because they know her and know that even if she fucks up she's not being malicious she's just being a person with flaws who wants people to be happy.
This got a bit long but, TL;DR: I think this is a complicated conversation with no one real group to point blame on and trying to point blame only causes more arguing and hostility. Instead we need to focus on combatting sexist/bad takes as they are.