1. The Bitemaster supports gay marriage
2. he wouldn’t shop at or recommend that store
3. But he doesn’t want the government to dictate to whom the store must or mustn’t sell.
Unfortunately, this is a clear cut issue. Places of public accommodation have to serve the public. To me, this and all of the silliness about bakers being given permission to not sell wedding cakes to same sex couples is exactly the kind of issue that was resolved in 1964 in Heart of Atlanta Motel v. United States, which ruled that the Civil Rights Act’s requirements that hotels, restaurants, and other businesses must serve all customers regardless of race.
The Hobby Lobby case muddies the water considerably. See, e.g., http://www.newyorker.com/news/daily-comment/hobby-lobbys-troubling-aftermath
Florist will serve adulterers but not gays: http://www.rawstory.com/rs/2015/04/georgia-florists-religious-hypocrisy-shell-serve-adulterers-but-gay-couples-are-a-different-kind-of-sin/