Most of my time spent in China was spent at my in-laws house. They have enough slippers at the front door to cover the entire Chinese Army, should they show up for supper. Whenever I am there, I get the biggest pair they have, which means that half of my foot is still on the ground. It is quite uncomfortable for me, but apparently, half my foot being covered is still a thousand times better than having nothing on my feet. For the bathroom, there was a pair of flip flops. I assumed the different pair for the bathroom was because of sanitary reasons. People shower in there, and also, the toilet is only a "squat", so a lot of evil germs lurking on the floor there.
Now that my wife is in Canada, I have total feet freedom. She doesn't make me wear anything, although, she is always a little shocked when I go outside barefoot.