I am surprised to hear about your experience, since I have never had any problem with any of the Chick Fil-As in California and Arizona. In fact, I would say that as a whole, this restaurant chain does the best of any fast food chains to train their employees to be friendly and respectful. (For the record, I have no personal connection to the Chick-Fil-A chain)
I noticed that you made it a point to single out the employee's race. Maybe that is your real problem, and not the quality of service??? And besides, if this is the only time that you have had a problem, and your problem seems rather minor - it's not like you were cussed out or anything like that, and you will condemn an entire chain by this incident, well then maybe it's Chick-Fil-A's gain.