Yes. Where is the line? Let's say I am a doctor. I walk along the street and there is a man dressed in one of those spiffy sheets with the eye holes. The man clutches his chest suddenly and falls to the ground. Can I just step over him because I don't like his fashion sense?
The law varies on that from state to state. The problem comes that if the doctor abides by a good samaritan law and tends to the white sheeted guy and something goes wrong, can the doctor be sued? Or anybody else who assists the person? If so, then there should be no requirement that any person be required to assume that risk.
While I never completely trust Wiki to get it exactly right, there is a really good discussion on this in the Common Law section here:
Duty to rescue - Wikipedia the free encyclopedia
The bottom line is that if we are each at liberty to life, liberty, and the pursuit of happiness. should the government be given authority to require one person to be in servitude to another person in any way? The exception would be in social contract that would require a person to be non discriminatory in their business or in a legal marriage contract that assumes certain responsibilities of husband and wife to each other and to their children. The reasoning is that those entering into business or marriage willingly assume specific responsibilities by virtue of their license/contract.
So then we get to the sticky wicket of how much must be required of a person in order to be in business? And does that include forcing the person to set aside all his religious, moral, and ethical convictions?
So I solve that problem with my conviction that yes, the person should serve even the person he abhors in his own place of business. But he should not be required to provide service at an EVENT which goes against his religious, moral, or ethical convictions. To me that is a perfectly reasonable compromise to achieve equal protection under the law.
In terms of the requirement of servitude, I think the answer is yes. However, it again becomes a matter how much. Can the government draft people into the armed forces? I can tell you the answer to that is yes, I served with quite a lot of them. Can you be compelled to testify in court? Yes. You agree you can be compelled to serve within the confines of the business site. So we come to that question again of where the line is. I'm not convinced where the physical location of the service matters, though I really do see your point. But a building is not an event. If selling flowers is not participating, I don't see how delivering flowers is. Let's assume we are talking about the hall rented for the ceremony. Can the owner of the hall refuse to rent it out for the same reason, despite the fact we are now talking about the business site?
For me, the question first is does the law violate the Constitution. I don't see that it does. Second, does it violate the State Constitution. In this case, again no. So whether I agree with the law or not, it is within the purview of the state to initiate and enforce the law. However, I am on the fence as to whether or not this particular application of the law is Constitutional. I don't think the florist was discriminating because they were gay. She was discriminating because she believes the ceremony is wrong.
When I argue what 'should's' and 'ought's' form my convictions and belief system, it really doesn't matter to me what the law says or what the court says. Right is right and wrong is wrong regardless of the law and court rulings.
I don't see service in the military or court testimony or jury duty as necessarily involuntary servitude however.
For instance yes, the Congress and Presidents and courts have agreed with a mandatory draft into the military. If every man and woman who physically qualifies for the service is subject to that draft, and it is done via a blind lottery system, that one is borderline for me. It is the constitutional mandate for the federal government to provide the common defense and those drafted are doing that on their own behalf as well as everybody else, so I think that one we have to think about. I do much prefer an all volunteer military as much as possible.
Being subpoenaed for court testimony or jury duty is another gray area--if our testimony is necessary to establish guilt or innocence or right or wrong, is this really servitude to another? Or an impartial and necessary system of achieving justice--one of those things we do in order to be citizens of a country just as we all should proportionately share in the NECESSARY funding of NECESSARY functions of government. Such things that benefit no privileged person or no special interest group but benefit all?
But again if we decide mandatory court testimony is a reasonable requirement for all citizens, people should be at least compensated for any financial costs or loss resulting from that testimony. And if mandatory jury duty is a necessary condition of citizenship, it must always be on a blind lottery system that ensures equal opportunity for all to participate.
Forcing a baker or florist or photographer or whatever to provide service at an event that is ethically, morally, or religiously objectionable to that business owner serves no uniform national interest and, IMO, violates every principle of what liberty is.