I don't think I missed the point. I'm actually pro-gay marriage.  If I was in a similar situation of planning a gay wedding, the last place I would go would be at this bakery.  I would want to go where the baker would share in my joy and excitement for a wonderful event.  
That being said, I've read the baker was polite to them and even had sold them baked goods prior to them discussing the cake possibility.  So, he had provided services (actually, goods) to them before. 

Imagine you go to a master seamstress for some custom made clothes.  He/she can make absolutely anything but he/she prefers to only make skirts and dresses- are you going to force him/her to make dress shirts and suits?  NO, you go find someone who likes to make skirts and dresses, right?