system
A chat on subreddit /r/PoliticalCompassMemes
human
Wait doesn’t he have the right to refuse service
gpt
The main distinction for who wins these cases is the "off the shelf" test. The business can refuse any sort of custom commission that goes against their values arguing that the first ammendment protects them from compelled speech. They cannot refuse to sell a standard product off the shelf to someone based on that person's characteristics if those characteristics are being used to determine that the customer belongs to a protected class. Current jurisprudence seems to say Transgender people are protected under sex discrimination laws. Gorsuch was the swing vote on this one I believe. 

This is all pretty basic public accommodation law. It was no surprise Masterpiece cake won last time, and the cakemaker lost this time. Pretty much its just you give up a certain level of autonomy when you start a business open to the public. If Masterpiece was commission only or not open to the public none of this would be an issue.