One Costco shopper didn’t comply when asked to wear a mask.

An unidentified Costco customer has gone viral for refusing to wear a face mask inside the superstore amid the coronavirus health crisis.

The shopper argued with an employee over the policy, asked to speak with her manager and plopped down to sit in the middle of warehouse club — all while a face mask dangled from her ear.

The camera began rolling at the Merchandise Returns counter, when a Costco employee asked the woman if she had a medical reason for not wearing a mask.

The customer said that she did not have a medical reason for refusing to wear a mask, instead exclaiming, “I am a United States citizen!”.

“OK, well, you have to wear your mask in Costco though!

Social media commenters had little patience for the shopper’s antics and refusal to wear a face mask inside the warehouse club.

According to the superstore’s COVID-19 updates page, all Costco members and guests must wear a face mask that covers their mouth and nose at all times inside the store!

Exceptions are made for children under age 2 and anyone who cannot wear a face mask due to a medical condition.