The 'freedom of speech' part has been explained, but I'd like to touch on the 'major sensory issues'. WDW is actually one of the few places some families can go and experience some type of vacation. Children with autism, severe sensory issues, and a myriad of other disabilities can have fun with their families at Disney. FP+,
DAS, noise cancelling headphones, strollers as wheelchairs, and so many other tools are offered so WDW is accessible to people who may not be able go to the average tourist destination. So many of the special needs kids I have worked with have gone to WDW and come back with new social skills, new experiences to share, and smiles on their faces. WDW is very doable for those with major sensory issues, as long as the parent does some research and planning. But to have a horrendous roar emerge from all around you, when you are least expecting an outburst from a crowd - well, you can't really plan for that, except to wear noise cancelling headphones all day. I don't think that should be necessary. Families are already planning sensory breaks, spending less time in the parks, etc. What else should they have to do in order to spend some time together at WDW, just like veryone else? Why can't these these chanters just learn to be respectful instead?