Let me think about this, comics included.
Captain Marvel has always just been there in the comics. She didn't really get people feeling one way or the other, until the comics made her actively fascist when they had their Civil War plotline. Being the first female-led Marvel movie, made certain sections of the Internet get really insecure, and that's the Brie Larson hate train that Youtube still tries to link people to. The movie is fine, but they made her so powerful that they have to keep her off the stage, and it didn't exactly make her lovable (and her very few Endgame scenes were shot before Captain Marvel, so she comes off even worse in them).
Ms Marvel is far and away the biggest success from when the comics tried to introduce many new teen characters at once (like three supergenius teen girls within one week, uhh). Their biggest fault was bogging her down with the 'let's replace mutants with inhumans' angle. It was amazing to see the show manage to capture the spirit of her books while doing its own thing... for two episodes, after which it forgot to be about her and just became an incoherent mess about nonsensical baddie bad guys.
Monica Rambeau has never been a big name in comics, with her biggest contribution being wearing the Captain Marvel mantle during the original Secret Wars. I always liked her, so imagine my vibes when MCU forcefully introduces her character in Wandavision with 'Wanda randomly gives her the powers she's supposed to have, then she'll say 'they'll never know what you gave up' when talking to the supervillain that was keeping a whole town captive and just had to stop doing it'. How is anyone supposed to like her after that?
So, yeah, while much of the active dislike of them is just the Internet automatically really hating having women in their movies, it's also not the strongest basis for a team-up, when the biggest character draw in it relies on people having watched a (very ethnic) teen show on Disney+...
I think Madame Web is the most obscure thing Sony could dig out of their Spider-Man And Related People folder. The backlash would be the same by itself - it's kind of a nonsense premise, and Sony's standards are firmly set somewhere around Morbius level.