Employers are the ones that set and enforce policies. If their policy is to stand up for the flag, then that is what the employee does. If the employee does not follow the said policy then he can be fired. It is the employer that sets policy not the employee.

This whole charade could have been avoided by just enforcing policy but the fool that is in charge of the NFL catered to the demands of certain players rather than listen to their fan base. At the end the fans are the real bosses.