I don't think this is good advice. Remember that HR is there to represent the company, not you. The manager is part of the company. You are only an employee. Even when you, the employee, are right and the manager is wrong, HR will protect the manager. They might deal with the manager at a later date, but that is no help to the employee.
Thats correct, and they will want to prevent an unlawful termination situation that is easily avoided. However, it's just as likely HR is staffed by morons, so you take you chances when you leave the house each morning.
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