Mm, I have to say that there were occasions when dd2 was little in her wheelchair or using her walker that I used discretion and didn't enter stores where she would inadvertently wreak carnage - because of the completely inadequate nature of their store layout - overstocked and too narrow for disabled access.
A store deliberately turning my kid away, however, would have had the wrath of satan on their head.
Misunderstanding, indeed.
Mind you, dd2 could knock over stands in freaking waitrose, in a ten foot wide aisle. her particular variety of cp meant that she was given a manual wheelchair, but the pattern of her movement meant that her arm motion caused her head to bow, so if she was pushing or steering, she automatically couldn't see where she was going. She was 'too able' for a power chair, which would have meant she could actually see where she was going. 