Boss told Fox News that although she thought the location did have noticeably bad service, the restaurant's managers "had no right to say that about their staff to the public".
The woman's Facebook caused controversy, with some agreeing that the sign was disrespectful while others believed that the managers had a right to call out their employees.
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"I wouldn't say that's the best way to address this situation … but okay," one person wrote.
Another added: "Entitled employees who don't think they have to work."
However, some thought the sign was funny.
"I'm dead, to me this is hilarious," one said.
A Taco Bell spokesperson told Fox News in a statement that it condemned the sign.
"The posting of this sign should not have happened and the team was immediately re-trained on proper protocol," the spokesperson said.
"We can confirm that the dining room reopened within an hour and we apologise to our customers for any inconvenience."