This happens more than you might think. I don't know whether it's because people are ignorant, or whether it be out of pity or the fact that they are fascinated because they're not used to seeing the disabled.
Whatever the reason, it can be very hurtful and distressing to the person and their family.
When I take the little boy out that I am a nanny to, we get this a lot, because it is obvious that he is 'different' than other children.
Either way though, it's not nice, and I wish that people would give the disabled a bit more respect by not staring at them and making them feel uncomfortable.
Being somewhat disabled myself I can understand that one does not want the added attention that many give a disabled body. However I will try to assist a more disabled person if I see them having some difficulty. But I do ask them if it is alright if I assist them for a short period of time. I know that I am grateful to have some assistance at times but do not need it all the time. I have looked at some maybe a little long but it was not out of disrespect.