Being a private business, this guy should have the first amendment right to serve anyone, or not. The couple getting married have the freedom to take their business elsewhere.

This is a slippery slope. If we continue down this nannying road, the Man will be able to censor  the wording used on the cake, the color of the frosting, or whatever they please.

Protected classes have a place in society, but need to be used extremely cautiously.