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Everything is discrimination by these standards. Disability is a personal thing for a lot of people, it's perfectly reasonable to be hesitant to ask people about it.

In addition you can bet not many disabled people want to be a walking survey of the problems they face. To that effect, you can check any disability forums, which are littered by engineers wanting feedback on their products. Hell, just look at the top post of /r/blind written 6 days ago.