People seem horrified by numbers like 1 in 9 are disabled, 20% need extra support etc but this does not seem unrealistic to me.
Why do we have such different expectations/experiences? I honestly think that this is the crux of the misunderstanding. And I strongly believe it IS a misunderstanding. There are bigoted views about disability, SEN etc and IMO they come from misunderstanding.
Because it's logical based on this premise - if you have been told all your life and believed all your life that disabled people are a tiny minority, that they are "other", to be pitied, that they are "not like you and me" (which is all pretty astounding and offensive, but it is the way a lot of people grow up, likely including both of those councillors) if you've never met anybody "like that" because they have been shut away in private not to interact with the rest of the world, then yes you probably do think it's a very small amount - maybe less than 1%. That would match up with your experience, and people tend to have a worldview formed by experience.
AND if you hold a belief about the world that everyone has to contribute and this is our collective responsibility, which some are exempt from because they are (too young/too old/disabled), but nobody really wants to do, we would all take the lazy/easy life if it were offered, then the idea that there is some kind of "elusive golden ticket" which is a disability diagnosis, and that anyone would seek it out if they could, that makes perfect sense in this context.
So yes, if you simultaneously believe that only a very small number of people are disabled, AND anyone would want a disability diagnosis because it exempts them from responsibility, AND THEN you're presented with numbers like 20% - then it's totally natural to be suspicious about where all these "extra" disabled people have come from, and to assume that they are just chancers after the "golden ticket" and not people who genuinely need support. Especially since in this case they are reading "support" as in financial support/freedom from responsibility.
It's logical based on those two baseline beliefs - but these are distorted. This is where the society-wide view probably needs to change (which, ironically or not, starts with NOT locking "different" children away in "different" schools because they can't possibly disrupt the education of the "normal" children!)
Disability is something normal, everyday, disabled people are just like everybody else but they have more difficulty in certain actions. What I find very frustrating about this is that those councillors are not sheltered young men. They are probably in their 50s or so. Surely they know of people who are diabetic, have a problem with one limb, are hard of hearing etc. One of them even had a visible tremor. I would imagine that they do not see these things as "disabilities" in the way that they think of disability. But they should not be thinking so separately about things.
Anyway, if you're seeing disability through this lens - as being a specific difficulty in certain area(s) of life, then the word "support" has a totally different meaning. It's things like ramps and lifts being provided for people with wheelchairs or other mobility problems, subtitles on TV, hearing aid-compatible systems, exceptions to animal bans for guide dogs. And support in schools for children who struggle to access learning as given in an ordinary way.
I did look at that Times article where the 1 in 9 comes from but I could not read most of it due to a paywall so I don't know what it refers to - it does seem to be 1 in 9 children (so not including elderly people) and the sentence I read said "disabilities, like ADHD", which makes me think that it probably includes both physical disabilities (cerebral palsy, deafness, visually impaired, paralysed, shortened limbs etc) and named SEN conditions. ADHD, dyslexia etc are not usually referred to as disabilities except in cases where funding or legal protection is relevant. Then they are sort of lumped in.
This is a useful chart - overall, 24% of the British population is classed as disabled, while the majority of these are adults over the age of 50, disability is not rare. Most disabled people are participating in ordinary life.
https://www.statista.com/statistics/449258/disability-prevalence-age-gender-united-kingdom-uk/