Well, there you have it. A diabetic's life is more important than that of anyone else on the aircraft.
Ref the thread mentioned by west lakes, I've posted the following:
I'd say that, if you don't want to get off then move into an empty row.
I think that, if you find yourself in the flow, you will be carried along.
DO NOT hold up the flow whilst you try to discuss with cabin crew or you may find yourself being walked over.