Trash cans

Okay, I am a very culturally-sensitive person and I'd like to think I am not ethnocentric. But I'm sorry, there is one thing that I cannot understand outside of the US: lack of trash cans. When I visit my family in India, there is just one "dust bin" in the ENTIRE house. When I was in a hostel in London, we had to ask a number of times for a trash can before we got one. What do the people in these places DO? How hard is it to have a trash can in the rooms where you'd frequently need one?

If I'm brushing my hair and I have a bunch of hair that comes out of my brush, am I supposed to put it in my pocket until I come across a trash can?