again, if you find yourself in this situation, what you need to do is the following:

1) be assertive, but stay calm.
2) ask for the manager.
3) explain to the manager that you're leaving the store because of the laws. that way, they understand why they're losing business.
4) take your business elsewhere.

https://www.cbc.ca/news/canada/manitoba/mask-restaurant-brandon-manitoba-1.5699001