It's strange to me is that we have TFA, TLJ and Solo portraying black males as cowards, liars, comic relief and cheaters, and, yet, the condemnation of the social justice crowd is directed at the public over the portrayal of women being too positive. Similarly, the one black main character in the last Ghostbusters doesn't represent black women very flatteringly, but there's no organized condemnation of that, just against the "sexist" fan base.
That's absolutely true, but it shouldn't be assumed that it was because of sexism. It's common for films to be blasted long before they're released, especially when they're remakes of classics. A remake of Ghostbusters, without any of the original cast and named simply "Ghostbusters," would've received significant backlash even if it had a male cast.
The fact that the cast was female did make the backlash worse, but not because people "didn't want women in it." It was because it looked lazy (take a popular movie, switch the genders and call it new) and like a stunt to "correct" the gender equality in the franchise (and if you don't think that that was on their mind, just look at the Hemsworth character). If you're going for that, though, doesn't a Ghostbusters team made up of both men and women make a lot more sense than a film that's just as gender unequal as the original? Regardless, I think that it's important to note the role of the accusations of sexism in fueling the backlash. You might post or tweet your negative thoughts once or twice, but get called out as sexist for them and you're liable to really get worked up.