Here, the signmaker would be compelled to create one which saysThat is another distinction that should be considered. Should a sign painter be allowed to refuse to sell a sign that says “Yard Sale” if the people buying it are a gay couple?
only "Yard Sale", but likely not one which says "Gay Marriage Yard Sale".
This isn't about who the customer is, but rather the service requested.
I once refused to serve a gay couple back when I managed real estate
rentals. It wasn't because they were gay, but because they wanted me
to do something unethical. Fortunately, this never went as far as court.