Most people have heard the phrase In with the good air...now out with the bad*.
The purpose of exhaling is to get rid of aerosolized toxins, waste, things not needed to keep us alive. When we sneeze that is also part of our bodies waste system to get rid of bad things in us, the same with coughing, all three breathing, sneezing, and coughing are utilized to rid the body of waste.
We have bowel movements and urination to remove liquid and semi-solid waste from our bodies. Part of sweating is to also rid our bodies of waste and maintain a steady temperature by cooling our bodies.
The people behind all of the mask wearing are just laughing their asses off at how many people they have trained to eat their own shit with out complaint. So it is unlikely anything a healthy non mask wearer says to a healthy mask wearer is going to make them take their mask off until they understand they have been taught to eat shit from the establishment.
...maybe it's some elaborate, global, IQ test...
If it is a global IQ test, then I think the world is ready for Idiocracy2 the movie.
No need - the IQ test they're conducting comes with self destruction of the lower IQ set.
Masks, voluntary poison recipients, and self imposed isolation, should do the trick nicely!