Corporations generally have poor track records in how they treated people, the environment, and the country. United States history is filled with examples of corporations behaving badly. Most American students have been taught something about the history of muckraker journalism. Or they grew up watching 60 Minutes and its frequent attacks on corporations. Or they or their parents have been laid off, underpaid, mistreated, etc. by corporations they worked for. Or they have felted ripped off by corporations in some product they purchased or service they received. The point is, many have negative views of corporations before you ask a single survey question about them.
In Disney's case, RCID does represent preferential treatment. With the "one vote per acre" election, Disney 100% determined who was on the RCID board. Disney controlled its local government. Corporate Disney was receiving a special consideration.
Those of us who follow this closely know that this benefited Disney, the State of Florida, and its residents. We know that RCID worked, and it worked well.
However, when you ask a causal observer, they typically only know the basics. Disney is a huge, super-rich, mega billion-dollar corporation. Disney received special treatment. Disney charges a lot to vacation in Florida.
So, when you ask the masses should Disney continue to receive special treatment, it's not surprising that the majority say "no". To the casual observer, the details don't matter.