The simple explanation to the OP's original post was answered by TusconJim. There is an awful lot of fraud and abuse being perpetrated by people who do not have a legitimate disability & it causes others to be suspect. More often than not it's a family member that takes advantage of a disabled persons HC permit, even though the disabled person is not actually in the vehicle or being driven. I'm not saying that it's right to be know what one's disability is, but I do believe that there is some value in people asking the question. If you're legitimately disabled, don't be offended, it could be a positive because it may cause an abuser to think twice about taking up a spot for someone that truly needs one, such as yourself. If I were disabled, I think that I would respond to a challenge by saying that I was in fact legitimately disabled (without saying what), and leave it at that. No need to get offended because ultimately is your interest that is being protected. Many people are ignorant as to what a disabled person should look like (think blue stick-figure guy in a wheelchair), so I don't think that they're trying to be mean, I think that they just don't know.