It's been almost two weeks now. My flatmate has been coughing all the time. Despite this, she is never going to see a doctor, never. So, I've bothered with too much noise from her.
I can clearly say that this is a kind of anti-social behaviour. I used to experienced many times when I was in Japan, this is a exactly the same phenomenon. In other word, people who don't care about this, I can say straightaway that "foolish". Nobody is happy with it obviously.