An advantage of wearing a mask indoors is that people who thinks masks are silly tend to stay farther away.
What's different this season is that some people who don't mask indoors are actually fully vaccinated. That's especially true is someone is over 50. The idea that Omicron is resulting is many more breakthrough cases is a shift in thinking from the situation in the fall when Delta was the dominant variant. Since masking isn't required outdoors, not a surprise that there are people who don't bother to mask indoors.
If I was just going to the restroom at Wolf Creek and there was only 1-2 other women around, I didn't bother to mask up. Wasn't inside there restroom for more than 5 minutes. And not really near anyone else.