Sorry to hear you had to deal with that guy. I too have a disabled card, although mine is temporary due to surgery. I have also seen a young, apparently healthy person jump out of a corvette and walk into a store with greater ease than I could, and wonder if that card was really his. There is abuse of the system, but NO ONE has the right to question or threaten someone because THEY think you don't need it, that's up to the authorities to determine, not some jerk with an agenda.