From a European perspective, I so often notice this in American movies. Everybody constantly with shoes in beds an sofas, apparently without a thought. Always grosses me out - it simply would not ever occur to me to put my shoes on furniture.
The one time I couldn't manage to get my boots off, I just sort of awkwardly slept with my legs hanging over the edge of the bed.
For example, if such things were a worry then I'd be more concerned over my dog's bare paws while outside and his nonchalant attitude of not wiping them as he comes inside.