Limitations of part.

This part does not: (1) modify the duty of an employer to provide a safe workplace for the employees of the employer; (2) prohibit a person from engaging in constitutionally protected exercise of free speech, including non-threatening speech and speech involving labor disputes concerning organized labor; (3) prohibit a person from engaging in an activity that is part of a labor dispute; or (4) create an agency relationship between a nonprofit organization and a volunteer donating services to the nonprofit organization.