Sometimes it is the world that's ableist, that's the point. If someone in a wheelchair turns up to a building that has level access so they can roll straight in, but the following day turns up to a building that has steps in front so they can't get in, that person has been impaired because the designers of the second building were ableist in assuming that everyone has working legs.
The light aspect and other such things are just common sense
I think it's easy to mistake "reasonable adjustments" such as level access and having dimmer switches as "common sense" when you're too young to really remember the world prior to disability discrimination legislation mandating reasonable adjustments, because service providers really weren't treating them as "common sense" back then. (They still don't always now: remember the building manager at my employers whining about the cost of the one blind I needed in an email to my line manager, which my line manager then forwarded to me to ask if I had any medical documentation I could submit to basically justify the cost. It was £300, in an organisation that turns over millions per year. I shit not.)
But that same person having chronic pain, that's not something that the world can accommodate. That's why both models have their place.
should be applied if needed
So, I face two burdens from being autistic:
- The effect of autism on me, so struggling with social stuff, photophobia, etc.
- Having to be "that person" and ask for adjustments. Having to fight to get what I need. Having to suffer in bright light, loud noise, etc whilst I wait for what I need to be provisioned.
Saying that the world is ableist is partly about tackling that second burden.
Let's go back to that wheelchair user. Level access "applied if needed" looks like having to go to the back entrance and ring a doorbell and wait in the rain for someone to open the door whilst everyone else walks up the steps and in through the front door. It looks like having to phone ahead for assistance because the only lift is a goods lift and a staff member has to operate it for you. It looks like having to have platform staff get a ramp to help you off and on a train and having to find those platform staff in time for your train and hope that they aren't busy when your train arrives. "Applied if needed" comes with a burden of having to ask. In a society that shames disabled people for existing in the first place, having to ask for an adjustment isn't a psychologically-neutral experience, for the disabled person or for the service provider's staff. There's always a feeling that you are a nuisance, in the way, inconvenient, or an attention-seeker. You end up apologising for asking for your own civil rights to be upheld.
It's not minimising nor is it insulting to recognise that the world is ableist, as long as we recognise that there is a medical aspect to disability that should not be downplayed.