These guys also hate Gal Gadot. They hated how successful Wonder Woman was and that also lead to Captain Marvel being made. The very things the alt-right incels hate. Yeah the people complaining happen to be also the alt-right complaining about how white men are being attacked by Hollywood. They don't want diversity in movies. They want the good ole days where it was only white men being the good guys.Mace, you've descended into a bit of a strange rant about white supremacists that clearly have nothing to do with the disconnect between reviews from critics and ordinary people on Mulan and other popular films.
I'm sure that some people don't like Brie Larson because of her positions on some issues, but these days most actresses are feminists. Gal Gadot is a feminist - she said that if you're not a feminist you're sexist. That's pretty clear-cut. If it was as simple as "I hate this film because feminism", there's no way there would have been alignment between fans and critics on Wonder Woman. If there's a difference in how Larson and Gadot are viewed, it's probably because the former seems rather bitter and the latter much friendlier.
Also, even if we might agree that sometimes film critics support bad films because of politics, it's hardly groundbreaking for a film about a Chinese story of an Asian woman to have an ethnically Chinese cast or for the lead role to go to a woman, especially when there have been other films on the same subject.
There was no internet before. If the internet had been established in 1980 you might have seen similar reactions.
Anyway, the fact there are people who dislike (or like) films for stupid reasons isn't news. The disappointing thing is that many critics no longer judge films on whether they're likely to wow audiences but whether they fulfill some abstract criteria.