Depends on how long I’m inside, how dark the store is and how much of a fuck I give on a given day. I do think that most people think it’s rude/douchey/etc., but I’m not convinced that I should care about that kind of moralizing of etiquette (though I do care, to various degrees, what people think of me).

It’s somewhat harder to see inside with sunglasses, but I, too, wear prescription glasses so it’s a bit of a hassle to change to normal glasses.