I hear this all the time from libertarians, especially recently when the whole gay-wedding-baker case came back to the forefront. Libertarians will scream that nobody has the right to their labor, therefore they ought to be able to discriminate against anyone they want, for whatever reason they want, and nobody ought to be able to do anything about it.
Except that’s not how it works. Nobody is making them a slave. They VOLUNTEERED their labor when they opened their business, when they accepted a license for their business, when they tacitly agreed to follow the applicable laws of the land as a consequence of opening a public accommodation business. Nobody is demanding their labor, they voluntarily offered it! People are just taking them up on their offer.
Of course, when you point this out, most libertarians will shut up and slink back into the shadows because they have no rational counter for it. The few insane ones will demand that they never agreed to anything and they aren’t bound by the laws of society and they can change their minds any time, but that’s not how it works and I don’t think anyone intelligent falls for that kind of wing nut libertarianism in the first place.
The fact remains that society has every right to pass whatever laws they like and think are valid and that you, as a consequence of your presence within said society, are obligated to follow the laws that society has passed, or go find another society in which you can do so. I don’t care if you like it, it is simply the case and has been in every operable society in the history of mankind. There has never been a case where people could do whatever they wanted with no consequences, period. Just because you want to doesn’t mean you get to. Get over yourself.
Of course, this doesn’t silence the fanatics because, as with the religious, they just don’t care if what they believe is true, so long as it gives them an emotional woody. They are people who simply do not comprehend humanity or human society. They want things they are not entitled to and refuse to acknowledge that they are on the wrong side of… everything. Because they don’t care. And that’s anti-intellectual idiocy.