CIVIL CODE § 51.5. Discrimination by business establishment prohibited, Cal Civ Code § 51.5
Summary
(a) No business establishment of any kind whatsoever shall discriminate against, boycott or blacklist, or refuse to buy from, contract with, sell to, or trade with any person in this state on account of any characteristic listed or defined in subdivision (b) or (e) of Section 51, or of the person’s partners, members, stockholders, directors, officers, managers, superintendents, agents, employees, business associates, suppliers, or customers, because the person is perceived to have one or more of those characteristics, or because the person is associated with a person who has, or is perceived to have, any of those characteristics.