People really believe this. And also if you mention other disabilities that affect a similar ratio to the one they care about, ie 0.16% of people, they'll say it's too expensive and doesn't affect enough people. Like what if I want this content to be consumable by people who have such heavy learning disabilities that the whole content would need to be 20x as long and explained much more step by step?

If 4% of the population cannot partake of your services, then it is you who are being the asshole, not the 4% of people asking for an accommodation.