I wonder if it's that there are lots of us who hate it, but just not anybody who can or would bother to do anything about it.
I wonder that about a lot of stuff, as neaurologically atypical people. What if the majority of us hate something, but it wasn't the any of us with the executive function?
Interesting, I only very recently learned I have actually been autistic, finally explaining the weirdness of my past three decades+, so I am not knowledgeable about what language might be preferrable. Self-stimulating behaviour? I can only speak for myself that I actually do like the term, to me, it has a nice sound, one of those words that, to me, feels good to repeat aloud to myself.
Its becoming a common term that you likely won't face much pushback over, I just personally take issue with it in regards to ADHD.
There are many people that see the perscribed stimulants we use to medicate, as no different then the ones which are often abused to get high. Essentially, that we're drug addicts. I've dealt with them before.
When you're medicated with stimulants, telling people that you're "stimming" doesn't really help to dissuade the negative connotations.
While it would be nice to disregard those people, many that I've dealt with have been in critical positions, such as managers, or on one occasion, even a doctor.