See that is the common sense approach and more people should use that approach to the places that don't want to make gay wedding cakes.
Of course, it's racist, but really... would you want to go there, knowing that they don't want you? Simply find a yoga class that will welcome you and go about your business, just like everyone else should be doing instead of suing just because someone doesn't want to serve them. There are plenty of other businesses to choose from. Bringing a law suit is trying to make a statement that probably doesn't need to be made in the first place.