As the pandemic wears on Americans, mild disappointments lead to bad behavior.

Nerves at the grocery store were already frayed, in the way of these things as the pandemic slouches toward its third year, when the customer arrived. He wanted Cambozola, a type of blue cheese. He had been cooped up for a long time. He scoured the dairy area; nothing. He flagged down an employee who also did not see the cheese. He demanded that she hunt in the back and look it up on the store computer. No luck.

And then he lost it, just another out-of-control member of the great chorus of American consumer outrage, 2021 style.

“Have you seen a man in his 60s have a full temper tantrum because we don’t have the expensive imported cheese he wants?” said the employee, Anna Luna, who described the mood at the store, in Minnesota, as “angry, confused and fearful.”

“You’re looking at someone and thinking, ‘I don’t think this is about the cheese.’”

It is a strange, uncertain moment, especially with Omicron tearing through the country. Things feel broken. The pandemic seems like a Möbius strip of bad news. Companies keep postponing back-to-the-office dates. The Centers for Disease Control and Prevention keeps changing its rules. Political discord has calcified into political hatred. And when people have to meet each other in transactional settings — in stores, on airplanes, over the phone on customer-service calls — they are, in the words of Ms. Luna, “devolving into children.”