Yes I'd hate to pass it on to others but I have yet to wear one. I barely go to stores and stay away from everyone at least 6 feet. My understanding was that as long as you can maintain social distance then mask wasn't that important. Thought it was mainly for people that have to crowd together like in public transportation. Here in Texas a majority still wear them in stores but more people are starting not to. Yes I know I'm terrible person not wearing one but I try to stick to nose breathing only and barely any talking while in gas station or store.
The mask reduce the particles you emit. In the open these particles are dispersed by moving air quickly, so the distancing takes effect. In closed spaces, without air circulation, the particles can stay and gather and spread throughout the room. There are examples of superspreading events that took distancing into account. The variable was time and closed room. Also talking/singing. So, the rule of thumb should be: wear a mask if you are close to others and indoors if these rooms are used by other people too.