Same reason people don't like Florida. Lots of targeted negative media coverage. Conservatives think California is a shithole where homeless people are everywhere and people don't get arrested for robbing a store at gunpoint. Non-conservatives think Florida is full of hard-core Trumpers who want to ban all gay people from existing and is like a redneck 1984.
Reality is more nuanced. Both states are very large populations with a diverse makeup. But nuance is hard to convey in headlines. I personally live in Florida and love it, even though I hate DeSantis with a passion. The people here make up for the shitty politics. And the pendulum will inevitably swing back to the other side.