They are not making campaign material. They are baking a cake. The only people who are going to see and/or eat the bloody thing are people who agree with its sentiment (which, let's remind ourselves, is hardly inflammatory, unless of course you're of a particular rather sad mindset). And of course they are entitled to their deluded opinion. Nobody said they weren't. But they are not entitled to act on that opinion to the detriment of decent people who wish to lead normal lives free of being discriminated against on account of the way they are made.