Open and honest dialogue is a precursor to changing minds. The bakery has reached out and said they welcome and service all of their guest. That's a good thing. You can view him as "on probation" and that's understandable. I'm assuming you would like the business to center it's self and comply with the laws of Washington. 
I will not endorse a business that discriminates but I accept the clarification of their business position and will be a customer until I hear factual information that shows they are conducting themselves otherwise.