Its is a very loud and noisy minority that is further amplified by the media and studios reaction to the minority. If you look up reaction criticism and Finn, Rose or Reva you'll find way more defense of their casting a diverse actor then any defense/criticism of the creative choices of the actual character. Not saying that there should not be any push back against the hate that is spewed over the internet by adult children that thrive on clicks and and attention. But the missive about of responses that the attention seeking morons get only feeds them to ramp up ad do even more. And Media outlets are not any better as making articles on hate expelling neck beards gets way more clicks than an actual critical analysis of the material.
Criticism on the mentioned Star Wars Characters; Finn: Completely underused! Was set up in the Force Awakens to be an awesome addition to the Star Wars universe but was completely wasted in the follow up movies. Which leads in to Rose: A completely useless character that wasted Finns potential by taking him on a side quest that "teaches" the former slave soldier that slavery is bad and that war is a convoluted mess were lines get blurred, like he needed to learn that. And Reva, first it's a bait and switch in which we tune in to watch Obi-Wan and end up with the Reva story with a little Obi-Wan on the side, then her story ends up being to get revenge for herself and the Jedi she goes around killing Jedi and seeking to kill small children? A poorly written character. But instead of these Criticism entertainment media focuses more on the small group that scream about diversity demolishing there childhood or what ever.
Another thing. The hate towards the actors/actresses. You can dislike a character or the story line that they are in but, the person playing that character has noting to do with it. They didn't cast themselves, they didn't write their script, they didn't direct or edit their scenes. These are people that were hired to do a job and that is it. I really don't understand how people can go after a person that had no creative control over their character because they didn't like the character. Its asinine, and I wish for the sake of humanity that people will at the least stop personal attacks on entertainers for just playing a part in a stupid movie or TV show.
That is way you see a bunch of remakes, reboots and sequels. It all comes with a built in fan base.