But I am quite sure that if the reason for denial of service was due to the customer being part of the protected class then such could be prosecuted as Jack Phillips (Masterpiece bakery) was and is for years.
Of course, including a class of persons thus protected on the basis of how they feel and act, versus non-moral aspects such as race, color, ethnicity, nat'l origin, and or being part of a recognized religion (which loses when the conflict it btwn the two), was unprecedented, and opens the door for inclusion of other classes based upon feelings and behavior.
Maybe the Uber driver can claim that his opposition to contraception was due to him/her being "born again" that way...
But even the SCOTUS does not see it that way. Which is why Jack Phillips won his case.
As a contractor (which he was) you are in an entire different class then a vendor.
I currently act as both vendor and contractor. I sell books, games and other media. You may come into my store and select any thing off the shelf you want and, providing you have the money and are an adult, I will sell it to you.
However I also take contracts to find things. I have customers who want to hunt down signed copies, unrevised copies, first editions and so forth. I will consider what you want and tell you, yes or no. I do not have to take your commission. I can refuse it for any number of reasons and I do not have to explain.