These people that refuse to wear masks are just puffing their chest and trying to declare they are macho men. Lol.
Here is why I wear a mask and how I decide when and where it is necessary:
https://www.erinbromage.com/post/the-risks-know-them-avoid-them
This article explains outbreaks in a call center, a choir practice and a restaurant. Long but very informative so an intelligent person can make the right decision, if not for themselves, for others.
The best advice from early on was that the mask will not prevent contracting cv19, but can help limit the spread if one is so infected.
Here is the bottom line from the link Snippy provided upthread to a rather scholarly article: "...do your part and wear a mask to reduce what you release into the environment. It will help everyone..."
Give that some thought FReepers; it is not a macho thing.