There has to be more to the story. No way the cop hasn't noticed that everyone is wearing masks now.
It happened last month when masks were not as common as they are now but still plenty of people were wearing them. The 2 men were wearing surgical masks and were followed into a Walmart by a cop who said they couldn't wear masks in the store. He then followed them out the store, repeatedly putting his hand on his holstered service weapon, when one of the men refused to lower his mask and they were ordered to leave.
In the video one of the men explains his belief that there were both state and presidential orders to wear masks. The men are black. Race was not mentioned in the video but I'd say the implication is definitely there.