Or maybe they're one of 12,943 medical and public health scientists who signed the Great Barrington Declaration [0].
> Simple hygiene measures, such as hand washing and staying home when sick should be practiced by everyone to reduce the herd immunity threshold.
Wearing a mask seems like a simple hygine measure to me.
Perhaps a signator might not wear a mask as a measure of protest against government "overreach", disregarding that part of the declaration, disregarding the law, and disregarding the risk of their actions to the health of their fellow citizens.
That last bit seems rather hostile. Rather belligerent. So I think we're right back to square one.
There are reasonable discussions and lawsuits to be had about how far is too far, and what reasonable public policy looks like. Even arguing on the internet sounds more productive to me than not wearing a mask as "protest" though.
Compliance is very high (>95%?), but the people who do not comply are basically the same people who were problems in the Before Times: belligerent, mentally ill, or both. The drivers almost always let them get away with it, again just as in the Before Times, probably because it's a risk to even interact with these people. I, for one, try very hard not to make eye contact with them or even look in their general direction; treating them like the Bugblatter Beast of Traal is at least moderately effective.
I do wish they wouldn't flash the stupid "Masks Required" on the route signs so often, though. It makes it a lot harder to tell which bus is actually arriving. And showing it on the route indicator on the _back_ of the coach is just spiteful.