It’s a policy of the owner of private property. You can’t really be that dumb, can you? Costco can damned well say ‘masks required’; if you don’t like it, don’t go there, if you go there, wear a mask.
So you dropped the “lawbreaking” part of your other post. Good for you.
Of course Costco can decree any POLICY they want. How does admitting that make me stupid?
And we quit Costco when the mask POLICY was instated. We only shop where masks aren’t required.
“God hath not given us the spirit of fear; but of power, and of love, and of a SOUND MIND.” II Timothy 1:7