Eh, you missed the point. Replace 'work with' with 'serve' or whatever. This ruling empowers business owners as much as anyone else to refuse service based on sexual preference.
But it doesn't because the courts made a limited ruling that doesn't set a strong standard either way. It also applies to the service provided, not to whom is served. A bakery that refuses to sell any cakes to a gay couple is going to have a much worse time in court than a bakery refusing to make a gay wedding cake, but even in the latter case, assuming a lower court doesn't repeat the same mistakes made in this case, the Supreme Court may still rule against the baker.