The Constitutional Law Group sites the Civil Rights Act 1964 Titles I & II as grounds to fight back against businesses who violate your rights regarding COVID issues.

According to The CLG, The legal, federal definition of a public accommodation: Public accommodation​ means a private entity that owns, leases (or leases to), or operates a place of public accommodation.

You can find more resources from the CLG here:
https://www.constitutionallawgroup.us/resources_2.php

The Tri-Cities Freedom Press has a list of legal resources here:
http://tri-cities.news/legal/

It is being argued by some that the Washington State Constitution is more specific in protecting individual rights, not only from government violations of rights, but from anyone violating rights. For example, the United States Constitution says “Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof; or abridging the freedom of speech, or of the press; or the right of the people peaceably to assemble, and to petition the Government for a redress of grievances.”

But in the Washington State Constitution, Article I (Declaration of Rights), Section 1 (Political Power), it says “ll political power is inherent in the people, and governments derive their just powers from the consent of the governed, and are established to protect and maintain individual rights.”
And the sections that follow on the rights of the people are not delineated as specified as protections only from government.