The problem is that the story will usually be told by the person who misunderstood the argument, and the other side's defense wouldn't have as much reach. "X is a sexist jerk" will gain way more clicks, attention and support than "I thought X was a sexist jerk but actually I misunderstood and we're all good - nothing to see here".
Furthermore nowadays there are plenty of people out there who love the drama and will be more than happy to keep pouring fuel into the fire, either for entertainment or in an attempt to virtue-signal how "better" they are by (appearing to) care about the issue. Worse, entire industries (social media) happily profit off this and encourage it by promoting the divisive content.