Sometimes really popular characters become "Cool" to hate on. Like Wolverine was the biggest thing in comics and then he became so mainstream and popular that liking him became uncool. Yes marvel overused him by putting him in 20 books at the same time. But alot of the hate was directed towards him as a character.
James foster Thor aswell. Everyone got upset with this diversity push with legacy characters. But Jane Fosters Thor was cool af and Jason Aarom wrote an interesting story around it(Didnt read it till recently)
Now I never read anything with Riri William's or the other characters people hated so I cant comment on them.