If we're going to support the right of good Christian bakers to refuse business with a sodomite couple's celebration, we have to also support this idiot's right to be an idiot. This sort of thing should be settled in the free market. If the sodomites want to boycott a Christian baker, that's their business. I won't join them; I disagree with them. OTOH, if this pizza hut idiot were in my area, I'd refuse to do business with him. I agree with the Marine, not with Pizza the Hut.
Selling pizzas to random strangers without regard for their private lives or personal beliefs is not the same as actively participating in ceremonies celebrating their sins.