yep, us liberal yanks can be quite bigoted as well. I would probably say that the most racist place I've ever been has been the family dinner table during thanksgiving, which just so happens to be in one of the strong blue states. And trust me, it doesn't make me proud.
really though, the ONLY way to make this guy pay for his ignorance is to:
a) make a concerted effort to have as many black people patronize his store and DEMAND the offending cookies. What would this chump do if there was a crowd of people every day who just had to have that cookie. Ideally, it would get to the point where he had nothing but African-American customers. Some would ever suggest that he add even more "outrageous" items to the menu.
b) Have every other bakery in the area create a "fat white slob" cupcake/cruller/danish and totally make that the new hot item to have with your coffee. Turn it into a standard bakery item.
"I'll have a medium decaf extra sweet & low and a Kefalinos to go"