https://motherboard.vice.com/en_us/article/qvymxq/captain-marvel-rotten-tomatoes-user-review-bombing

Hours after the film’s release, people who had already decided they hated Captain Marvel started review-bombing the movie on Rotten Tomatoes, before they’d even seen it. Captain Marvel is a comic book movie about an Air Force officer who is also kind of an alien, and loves cats, and happens to be female, and for some people that's a big problem. Countless angry reviews on YouTube read the movie's female lead as "feminist propaganda" and pandering to "social justice warriors."

According to The Hollywood Reporter, by 8 a.m. on opening day, the film had a 33 percent audience score from more than 58,000 reviews. Rotten Tomatoes said that the site was counting user reviews submitted prior to the movie's release due to a bug, and once the bug was fixed, that score bumped back up to 35 percent. As of writing, it has a 59 percent audience score, which is the score determined by the site’s users.