Free speech is already a civil right. You are not talking about free speech. So employees would not be allowed to quit working for an employer because that employer used their free speech to support a position they were morally opposed to? Anti-discrimination laws almost exclusively protect who you are i.e. race, gender, nationality, religion, physical ability. Free speech is about the viewpoints you choose to express and the actions you choose to take. You have the freedom to speak and act how you choose, but I also have the freedom hear you and choose how I interact with you or choose not to at all. You can’t legislate that person A is free to speak but person B is not free to react to that speech, as you are restricting the basic freedom of person B. Of course, when B uses their speech and A is not free to react, you are now restricting everyone’s freedom and everyone loses their freedom. As opposed to not legislating the speech or the reactions to that speech and individuals have the freedom to make their own choices and live with the consequences of those choices.