If a person doesn’t want to make a cake for a gay couple, even a generic one, and the person is then compelled by law, how do you think that will play out? Perhaps the person really is that asshole we all love to hate. It seems rather plausible that the asshole will make the cake, but make it taste horrible. Nothing unsanitary, just heavy on the turmeric and crab cakes. What now? Are you going to compel the baker to make “good” cakes? Should there be a “Department of Good Cakes” regulating the making of cakes?
Just let the baker do what he/she wants with his/her property. The business will go under, and the asshole will feel every painful loss of revenue as more and more customers go somewhere else.