I have a hunch that there are several factors at play in urban/rural mask wearing. I think a lot of rural areas are getting hit later just because the virus has taken longer to reach those areas, which in turn made rural areas more skeptical of the need for masks. Now it's hitting those areas and they'll adjust.
I think there's possibly an impression that the virus spreads slower in rural areas due to population density, but I bet that's not true. Rural areas still have density in towns and people still interact. Maybe it's a bit slower, but I bet the difference is scant.
I think rural areas have also been more receptive to anti-mask messaging for reasons that aren't allowed in this thread, and it'll take them time to recognize that and adjust their thinking.
That said, my home town gets a face palm for some idiot mom organizing a big dance because "she all don't believe in that thar virus and them thar kids shuld have them some fun".
https://www.dailymail.co.uk/news/art...der-event.html.