If we're going to start boycotting entire geographical areas because select businesses within their boundaries - fractions of a single percent - might refuse service, then... I don't even.
We're talking about a state law here, which presumably represents the general will of the people of the state. If Indiana puts up border signs saying "Welcome to Indiana, Gays may be refused service" it doesn't really matter whether 90%, 1%, or 0% of businesses actually do so - putting it in the law declares it a value of the people of the state.
Should I start walking into clothing stores demanding they stock clothes to fit my unusual size? Should I walk into coffee shops, demanding they accommodate my taste for foreign music and tea?
Orthogonal issues: this is not about stocking a particular product, this is about making a product equally available to any person. If the clothing store refuses to fit you until you pledge devotion to Allah, or if the best coffee shop in town demands you kiss a copperhead snake before you place your order, then maybe you'd have a complaint.
If you really want to push the coffee-tea analogy, would you take a large, diverse group of friends to a coffee shop that explicitly refuses to serve tea, knowing that some of your friends prefer tea? I suspect you would find a different shop/state that is more willing to accommodate your group. You might even tell the store owner that you're sad you couldn't bring your party to his place, but for the discrimination against tea.