Much like trans issues, ableism is very hard to get people to empathise with until they actually know people affected by the issue that they care about. Trans issues have got easier and easier with massively more trans people coming out than previously, the visibility and people wanting to discuss it has helped.

This is hard because people don't really get "out" with ableism and do not have a nation-like community like lgbt with which to get support in fighting the social current and telling people around them to stop doing [thing that's bad] each time they do it.

Outside of very pronounced issues visibility is pretty low for neurodivergent people.