I think a huge problem in fandom is the fact that people consider their fandom to be their IDENTITY. You are more then the things you like!
I think outrage over how stories are told is a pretty normal human experience. Storytelling has always been a thing, and its always been a thing that’s had genuine impact on society. To the point that there are common phrases and concepts in our collective cultural memory that will reference stories written literally centuries ago. English departments are literally full of fan fiction and meta written about ~classics~. People have always loved and heavily identified with stories, and I think modern fandom is just another evolution of that.
Also, when I was a teenager, fandom was for me (a scared, suicidal, Church of Christ raised baby gay living in the deep South) the only outlet through which I could be authentic. And when you live in a community that does not approve of you there’s something extremely vital about having media you can look to and see yourself in. Now as an adult who is very comfortable in her own sexuality I view fandom as a hobby, but when I had nothing else it was a lifeline. I’m not a big fan of knocking on the things people use to survive.