If you are physical distanced, especially outside, there is very little reason to wear a mask (for C19 reasons). I'm not sure why that makes sense to those people?
I'm working from home, but the people in my company who are working at the building try to stay at least 10 feet away from each other in their work space. Frequently they are the only one in an area of the building so their spacing is more like 200 feet and several walls. In common areas (bathrooms, kitchens, meeting rooms*) they wear masks even if no one else is there because eventually someone else will be in there.
*When most of us started working from home the people in the building would gather in meeting rooms once a day because 'that is how we always do it'. One day there was 10 of us wired in from home meeting with 6 sitting in a room at the building when a team leader (not mine) said "we're in a virtual meeting, why are we all gathered in this room?", she exited the room followed by four others. In about five minutes we restarted the meeting, from 16 different locations. It was an adjustment time, figuring out the new way (at least for a while) of doing things. The team leaders still physically meet almost daily, but with only 4 or 5 in a meeting room designed for 35ish, they can easily keep physical space.
I live in Hong Kong where mask use in public is 97% and that's no joke - But in the workplace, especially where there is limited public contact it's far less than 97% - Physical distancing in a workplace is irrelevant if your personal hygiene is deficient - Exposure to COVID19 is all about prolonged one on one exposure to an infected person without taking the necessary hygiene standards.