I don't really understand the animosity toward wearing one.
It's annoying for sure but if it even slightly decreases the chance of you getting a virus that may kill you (or worse someone around you that's more susceptible than you) then just suck it up and wear the thing. IMO it's simply selfishness and pigheadedness otherwise.

As 2in2out said, I'm not going to wear one with my immediate social group as it isn't going to matter if we're all in the same boat (literally) all day long whether we have masks on or not, but when interacting with others outside my group IMO it's a small inconvenience that could potentially save someone's life.

How would you feel if your macho attitude and pseudo-medical knowledge caused you to refuse to wear it when you go to Lowes, and the nice lady at the checkout takes it home and gives it to her diabetic mom who then dies from it? Is it your fault, probably not, but you could have prevented it or at least lessened the likelihood of it happening by putting a mask over your face for the 20 minutes you were in there. It's just the least you can do as a human being to at least try to minimize the ill effects of this thing.

As to inside vs outside I'm sure as hell not going to wear my mask walking around outside alone. But if I come into close proximity to others sure why not?

I'm young and healthy and frankly don't care if I get it or not, but my mother and father both have preexisting conditions that make it much more dangerous for them so I stay cautious so I don't give it to them.