When something in pop culture becomes so ubiquitous that liking it is mandatory. People infected with Disney disease will dismiss any and all criticism as petty contrarianism, no matter how obviously flawed or downright awful the thing is.
Named after the company that reduces everything to flavorless gray mush.
Examples: capeshit, Harry Potter
My friend thinks I'm a depressed asshole because I never want to see his shitty MCU movies. He has a bad case of Disney disease.