And that’s why the issues have come up regarding merchandise with relevant expressive content, such as custom decorated cakes, flower arrangements, and event photography.
Far fewer will object to selling blank cakes and decorating equipment, bulk flowers, and cameras, than will object to being intimately involved. If the responsibility for what to express about the event is yours, then it is not mine. But if you want to make it mine, I have to say no.
My wife was eating lunch at Panera and overheard a wedding planner discussing a wedding with a woman. Come to find out, it was same-sex. The planner asked if she wanted any personal decorations and the woman said “I have a lot of rainbows”. The planner responded “It’s a wedding, honey. not a political rally”.
The planner seemed appalled by the lack of reverence for the whole thing.