The cake had no writing.
Irrelevant. You said he ought be forced to write 'Gender Transition Celebration Day' on the cake, if asked.
Bakers are in the business of writing what other people want.
Bakers are in the business of baking cakes, and they should be free to refuse to bake cakes that express messages they don't want to express.
Nobody forced them to be in that business.
So what?
But in business you can't discriminate illegally.
Yeah, we know that. You think it is, or ought be, illegal discrimination to refuse to bake gender transition cakes. I don't.