"In the short time beginning on May 1, 2020, that face coverings have been required for entry into stores/restaurants, store employees have been threatened with physical violence and showered with verbal abuse."

Said Stillwater City Manager Norman McNickle, quoted in "Oklahoma city ends face mask rule for shoppers after store employees are threatened" (NBC).

The city government made the rule, but it was left to workers in stores and restaurants to do the enforcement, so they were the ones who got the abuse from citizens who didn't like the rule. Apparently, there were threats of violence against the employees, so the city abandoned the rule.

When I first read that headline, I thought the problem was that people in masks were threatening violence, and the mask rule was ended so the malefactors could be identified. But, no, citizens intent on showing their face were going ahead and threatening violence.

I wonder what kind of a place Stillwater is. Wikipedia:

The north-central region of Oklahoma became part of the United States with the Louisiana Purchase in 1803. In 1832, author and traveler Washington Irving provided the first recorded description of the area around Stillwater in his book A Tour on the Prairies. He wrote of “a glorious prairie spreading out beneath the golden beams of an autumnal sun. The deep and frequent traces of buffalo, showed it to be a one of their favorite grazing grounds.”
According to one legend, local Native American tribes — Ponca, Kiowa, Osage, Pawnee — called the creek “Still Water” because the water was always still. A second legend states that cattlemen driving herds from Texas to railways back east always found water "still there". A third legend holds that David L. Payne walked up to Stillwater Creek and said, “This town should be named Still Water”. Members of the board thought he was crazy, but the name stuck.

Stillwater Creek received its official name in 1884 when William L. Couch established his “boomer colony” on its banks. While the creek itself was tranquil, the next few years saw turmoil as pioneers sought free, fertile land and soldiers held them off while complicated legal issues and land titles with Creek and Seminole tribes were hashed out....

I like that Washington Irving showed up. And the term "boomer colony."

AND: About those boomers:

"Boomers" is the name given to settlers in the Southern United States who attempted to enter the Unassigned Lands in what is now the state of Oklahoma in 1879, prior to President Grover Cleveland opening them to settlement by signing the Indian Appropriations Act of 1889 on March 2, 1889. The Sooners, settlers who entered the Unassigned Lands just prior to the April 22, 1889 official opening, were preceded by Boomers by a decade.

The term "Boomer," in relation to Oklahoma, refers to participants in the "Boomer Movement." These participants were white settlers who believed the Unassigned Lands were public property and open to anyone for settlement, not just Indian tribes. Their belief was based on a clause in the Homestead Act of 1862 which said that any settler could claim 160 acres (0.65 km2; 0.25 sq mi) of "public land." Some Boomers entered the Unassigned Lands and were removed more than once by the United States Army....