After living with many roommates over the years, I have noticed that some people shut the bathroom door after taking a dump. This rather shocked me since my family had always left the door open to air it out to be polite to the next person. My dad would always joke about it and say repeatedly, "gotta air it out, air it out." One of my current roommates does this and she doesn't even open the window wide either. Do you think it's because they are embarrassed or something? It doesn't make sense to me cause it only makes it worse if someone uses the bathroom soon after. What do you do?