If I bring my foreign car to some car repair shops where the shop owners told me they don't service or repair foreign cars, are they discriminating me because of my nationality? Of course not.
All I have to do is bring my car to a car repair shop which service and repair foreign cars. I can't dictate to any particular car repair shop and insist they repair my foreign car whether they like it or not.
BTW, how long does it take for the case to wind up in court? And were these gay couples just not getting any wedding cake elsewhere for their wedding or did they just post-pone their wedding until this case is all settled all the way to the supreme court? So that they could get this particular baker to bake them some friggin gay wedding cake?