That's what I like when I was on holiday in South-East Asia (Thailand, Indonesia, although I've heard other countries in the region are the same). Since the SARS epidemic of 2003 (I think) they put on a mask in public then they are coughing. We used to laugh with them when they showed up wearing masks in the airport. Now, not so much anymore.
We will have to do the same. Even if you have a cold, you wear a mask so as not to infect others.