I've got a great comeback. If it were me, next time I would find a friend who trains dogs for the blind and ask to borrow one, then put on the dark glasses and go to the theater and see what they say. On the one hand, no one would want to challenge you on something like that, but then they have to reconcile why a blind man would go to a theater in the first place. Let's see how the manager would deal with that dilema. Take along a few friends with cell phone cameras and just in case she makes a big stink about it have them whip out the phones and act like they are videoing the whole thing. That would surely pickle her good.
Or you can just do like me and sneak everything in. Unless they do a pat-down, they aren't gonna even know to ask the question. Yeah, it doesn't address the obvious discriminatory aspects she presented you with, but I prefer to simply go around the obstacle if I can, unless I want to address the principle of the matter, which usually isn't worth my time anymore. Besides, it feels good to be able to get away with breaking their freakin' rules once in a while.
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The ultimate result of shielding men from the effects of folly is to fill the world with fools.
-- Herbert Spencer, English Philosopher (1820-1903)