Flaps,
Thanks for your well considered reply.
I agree that CCs cannot be expected to assess accurately the degree of handicap or degree of inebriation of their PAX; that would go well beyond their duties (and I suppose competence).
I suppose that my theme is partially motivated by some kind of denial of my handicap, but actually I think not.
What I feel increasingly is that there are rigid rules in force, for very good reasons, which cannot be varied upon a whim, and CCs who deny me the exit row are applying correctly the rules they have been handed down. I have no grudge against them, nor the rules.
During the course of a tedious flight, one gets to thinking about this kind of issue however, and I put myself in the place of an able bodied PAX stuck in the aisle behind a cripple who is a bit slow to get out, whereas said cripple could have been first out and well away by then.