I find some jokes about disabilities to be funny, specifically the ones that I have, I am anemic and find anemic jokes funny, even if they are a little absurd, I don’t stiffen in to a plank and fall over a table when standing up but it’s still funny to me. I understand why some jokes aren’t funny, I have adhd, and adhd jokes when made by another person with adhd is funny but not when it’s made by somebody without adhd, cuz like they don’t get it, idk how to describe it. So now I’m curious when does making a joke about a disability turn into ableism?
I’d say there are two steps when asking this:
1. Is the joke making fun of people having the disability?
and 2. Is it made by someone with that disability?
Take for example, you mention ADHD, so one of those “pov ADHD” videos, they tease at certain traits common with those that have adhd, so this is why that second question is important. If made by someone with adhd, the joke comes from relatability and understanding, maybe some self deprecating humor, but if made by someone without adhd, it comes off as superficial and more bullying than having a laugh about stuff you do, as now it becomes targeted at other people.