Yeah mutants have embraced the ideology that their the "next step" in human evolution and tbh they never really lost that. It's a sentiment they shared during Morrison's run. The difference being they've never pursued the ideology so aggressively before they've always tried to "make nice" with their oppressors and more worried about rocking the boat.
They're done with that. After so many genocides they're finally putting their foot down. And that's what's really getting the humans upset. In less than a year mutants went from an endangered species of a couple thousand scattered around the world to creating their own nation and becoming a major superpower in not only earth but on the Galactic stage as well.
No matter how you look at it that's pretty terrifying. And they don't plan on slowing down either.