According to the state of WA dept of labor and industries these constitute retaliation:

Retaliation An employer cannot take adverse actions against an employee who exercises a protected right, files or intends to file a complaint, or who has discussed potential violations of their rights. Prohibited adverse actions may include:

• Terminating, suspending, demoting, or denying a promotion.
• Reducing hours or altering the employee’s work schedule.
• Reducing the employee’s rate of pay.
• Threatening to take, or taking action, based upon the immigration status of an employee or an employee’s family member.
• Subjecting the employee to discipline, including write-ups, verbal warnings, points, etc.