Sunglasses - is it rude to wear them indoors?

[Stevie]

maybe its just me, but i think its rude to wear sunnies inside if your talking to someone (checkout, run into some you know) where i work (subway) i hate it when people where sunnies inside coz you cant se there eyes and whether or not they are paying attention, 'hello, im making your freakin lunch here' LOL
i wear sunnies 24/7 (pretty much) coz i wear them so much, when dont wear them i end spuinting and i get a headache, but i always take them off inside, i dont care if people wear them walking around or whatever, most times when i see poeple with sunnies on insdie i envy how they can still walk around and see properly lol

[Lolli]

I don't think it's rude, but I will confess it bugs me if I'm talking to someone and can't see their eyes.

[Tinks]

I don't think it's rude to wear them inside but when I see people with htem on inside I do wonder why they're hiding their eyes.

[suse]

I wonder why it's considered rude to talk to someone inside with sunnies on, but not outside? The effect is the same whether one is inside or outside - ie: the eyes can't be seen. I mean, it's obviously because it's not considered necessary to wear them inside, but if one would not find it difficult to have a long conversation outside with someone wearing sunglasses, then why would it be so if they were worn inside?