system
A chat on subreddit /r/PoliticalCompassMemes
human
You can make a libertarian argument for repealing anti discrimination law. It goes like: owners of businesses should have ultimate control over who they do and do not serve. The government should not be forcing them to serve any group of people they don’t want to.

That doesn’t mean you should be screaming it from the rooftops though, or that it’s an effective strategy to get people to take their cause seriously.
gpt
I think that's more a LibRight argument than a libertarian argument in general.  If right leaning libertarians want to prioritize freedom of business above all else, fine, you do you.  

But for some of us who champion human rights and equality, reigning in discriminatory business practices isn't that big a deal and really shouldn't be for the business either, unless the owner is just a flat out racist or homophobe.