I do see what you mean. You might argue that you only make that bra in an adult size. Likewise you might argue that you only make wedding cakes with flowers/non human figures. And if you did so, fair enough that you wouldn't want to put two brides on. There are some religions that prohibit the use of human images anyway (strict islam being one). Also to throw into the mix: you're a wedding caterer, you're Jewish, you don't make or serve food with pork. Someone asks for sandwiches with ham instead of salmon. Are you required to make those? If the wedding cake guy said: "I can't make you a cake saying "Ben and Steve's Big Gay Wedding", but I can make you cake with flowers, or one with a generic "Happy Wedding"" - would that be okay? Then back to the first example, you could offer to make the dodgy-looking dude a bra, but only in an adult size or above. Then you have the dilemma that his wife is a midget/little person...