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People often have very real reasons to wear them inside. I think it is rude to expect people to take them off. You don't know why they are wearing them!
FWIW I don't have prescription sunnies and I do take them off inside, but I don't care whatsoever if other people want to wear them.
People make choices with everything in life, just because some people don't agree with their choices, doesn't make it wrong.
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I feel a bit stupid walking into a shop with sunnies on (prescription) but it would usually be somewhere like bunnings, not a shopping mall type of thing.
I don't really care what other people think though ;)
