Final answer:
The charge nurse's first action should be to request an immediate private meeting with the health care provider and the UAP.
Step-by-step explanation:
The charge nurse's first action, in this case, should be to request an immediate private meeting with the health care provider and the UAP. By addressing the issue privately, the charge nurse can discuss the unacceptable behavior and find a resolution. This approach allows for open communication and the opportunity to address the issue without involving management right away.