I'm Canadian, and technically in a city where they could fine me for not wearing one, but I haven't worn one yet. I do groceries about 2x/week. I'm just not a dick about not wearing it, no one except Karens seem to notice/care. My usual interaction with the greeters/enforcement team goes like this.:

Brownshirt: "Hey, do you have a mask?"

Me: "No"

Brownshirt: "Want one?"

Me: "No thanks"

... Proceed to do my grocery shopping.