Up front: I don't have a medfet, but I think I'd give it a whirl.
Humiliation can probably be a large part of the exam/procedure for many patients during the role play. As can many other aspects such as outright sexual gratification, erotic anticipation, or even a very vanilla detached interest.
Depending on the reason for the exam/procedure, humiliation can start at any point during the exam. I imagine some patients feel humiliated the second they step through the door, remove a piece of clothing, or even speak to/are spoken to.
We're all different. Our likes and dislikes are different, even when when there is common ground.
As long as it doesn't take anything from me or cause me discomfort outside my limits, “getting” what someone else finds enjoyable is of no concern to me. Watching videos or viewing photos of expulsion after a subject receives an enema repulses me and, at the same time, fascinates me. If/when I look at it, it's my choice, as it should be for anyone involved in the roleplay.
When I say, “I don't get ” it usually means that, no matter what the other person's intention or motivation is, I find what they are doing as unacceptable and I am trying to say it so I don't appear to be a complete bore. But, that's me.