On the train or other forms of public transport. In waiting rooms etc. People coughing with half-hearted hands held up to their mouths. Blowing their noses with abandon. None of them wearing masks, just shedding their viruses into closed spaces.
Isn't it just common decency, after we went through a global pandemic, to try to protect those around you? It's super normal to wear a mask in parts of Asia if you are unwell to reduce the risk of your germs spreading to your fellow humans.