My current practice on masking up in stores is as follows: I look around the store to see how many others are masking up. If most people have masks, I'll keep the mask off to let others know a vaccinated person does not need a mask. If most people don't have masks, I'll put the mask on to encourage others to say that a vaccinated person does not need a mask.
Liberdon is a Mastodon instance for libertarians, ancaps, anarchists, voluntaryists, agorists, etc to sound off without fear of reprisal from jack or zuck. It was created in the wake of the Great Twitter Cullings of 2018, when a number of prominent libertarian accounts were suspended or banned.