As has been stated, if you feel you have not been helped properly helped, you are more than welcome to ask for a supervisor. We do not welcome, however, people calling names here, no matter the circumstance.
The OP was asking for what under the ADA would be classified as a "reasonable accommodation." In order to receive the reasonable accommodation, the person must first qualify for it. No paperwork or proof is required, but it is provided for those who self-identify as having a disability or need, and who would benefit from that particular kind of accommodation. Accessible queues are also a reasonable accommodation, so this may be what would be of most use to a guest.
The questions CMs ask are about NEED, not a medical diagnosis. In fact, most MDs, regardless from which school, do not know what my diagnosis is, much less someone outside of the medical field. The CM is not trying to shut people down - they are trying to make sure the CORRECT program is being used.
If a guest has difficulty with walking, standing, or other mobility or stamina concerns, the
DAS is NOT the correct program. My family can tell you this first hand. I have a DAS and a wheelchair, but my father had leg surgery and still cannot stand in one place for more than a few minutes. He is fine with walking or sitting, but standing is hard. The DAS resulted in much more walking (to get the times) and much more standing in one place (once we waited and arrived at the ride) than other accommodation.
This is why Disney suggests renting a wheelchair or
scooter, and does not issue DAS cards to people with only mobility or stamina concerns.