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Maybe it was just a bad day for the employee.
The employees form was way off but maybe that was the purpose of it.

Personally I don't use such meetings for handing out assignments.

Take the person aside in a non threatening way and explore the reasons why the assignment was felt to be unneeded. Explain your position and if after the discussion you feel the task still needs to be done explain the that the task really does need to be done and that the best person for the job was given the task.

Life is not always easy.