To my knowledge, Oneida is difficult to obtain a full carry permit. I have a few friends that live there and they were not able to get carry permits a few years ago.
It's a private business, they can enforce any policies they want. You don't have to agree with them, but it is their right. Best bet is shop somewhere else, or be prepared to wear a mask. The mask policy will soon be at every or most businesses, partially because they don't want the liability if...
People that voted for gun control are pissed they can't buy a gun same day in California, serves them right.
https://www.redstate.com/kiradavis/2020/04/10/815520/