If there is a super deadly virus out there making people drop dead, what the fuck is a mask going to to stop it?
As for not spreading it to other people - let me think, here's an idea for people, cough and sneeze into your sleeve, that's actually advice doctors have given for many years.
I went shopping for the first time in months. I had a mask in my purse. I walked out of two stores because an employee asked me to put a mask on. Neither store had a sign saying masks were required at the front of the store.