I think it goes both directions, some reviewers praise the film because they're afraid of misogyny accusations, some pan the film because they've been against it from day 1.
Perhaps, but I think you are far more likely to see reviewers feign positivity to avoid being labeled as sexist than you are to see people feign negativity due to sexism. Now there may be people who are overly critical due to comparisons to the first movie, but despite what some have argued, that is perfectly fair. If Feig and Co. did not want to be compared to Ghostbusters, they should not have made a Ghostbusters movie. Comparing a remake to an original is not inherently unfair.
Beyond that, I think former is actually happening where as the latter is hypothetical. If you read these reviews, they almost all read the same. The "fresh" reviews point out every bad thing that the "rotten" reviews point out. They are equally critical in nature. The positive reviews, however, seem to rely on abstract concepts to feign positivity (some, not all). I've never seen a movie, other than this one, get a "fresh" review, after pointing out so many flaws, simply because "the cast seems to be having so much fun." Yet here we are.
Remember, when a critic submits to RT, they pick between rotten and fresh. I think many critics are hesitating to click that rotten button out of fear of being labeled a misogynist, and I think if people actually read the reviews rather than looking at the jpeg next to it, they will get a much better feel for what this movie is; average.
Again, the backlash goes both directions, "supporters" call haters misogynistic, haters accuse critics of being paid by Sony, being SJWs, giving fake positive reviews , etc.
Eh. I disagree. I mean, yeah, it'll happen in the corners of the Twitterverse, but that has about as much credibility (or as large of a stage) as people who claim Disney bought bad reviews of BvS. No one takes that seriously.
Here, on the other hand, you have the movie's director, with a fairly large stage, already having suggested (more than once) that if you don't like this movie, you're sexist. The Tomatometer has just handed Feig a loaded gun. He can now say "SEE!?! MY MOVIE IS GREAT! IF YOU DON'T LIKE IT YOU
MUST BE A MISOGYNIST!"