Sadly, it used to be a quite common attitude that anyone with a physical difference was somehow subhuman and disgusting to be around, and 'normal' people should be protected from having to see a wheelchair, or crutches, or someone with spastic movements. Karen Killilea was born premature in 1940 and developed cerebral palsy. Her parents had to take her to 23 doctors before finding one who did not advise sending her to an institution, even though her condition was manageable and her intellectual and emotional development perfectly normal. She tells of going on an outing with her parents and seeing a group of children from an institution, all using various assistive devices and with various issues. People around them had no problem talking loudly about how disgusting it was that 'those people' were out in public where they could be seen, and how rude their caregivers were to impose them on everyone else.
Some people have never gotten past this viewpoint.