As I think about it, it seems that the stereotype references of fried chicken and watermellon being applied to blacks is used less and less... But, when I was a kid, it was a major stereotype. There were many many racist remarks being made that involved watermellon and/or fried chicken.
For the younger generation - many of the members here - you probably don't realize how widespread such remarks once were. But, that teacher is older and should have known better. It was poor judgement in his case, to write such a question. Anyone his age with any degree of common sense would know what outcome to expect.
Still, I agree with the discipline he received - slap on the wrist and "you should know better, shame on you!" It wasn't that bad of a joke.
And, as far as writing questions like that for tests goes, they're great questions because you can use them as markers to know how your students are progressing (watch for the smiles or the subtle giggles), plus it helps relieve a little of the stress some of the students are going through as they take a final exam. If you write a relatively simple problem into a humorous word problem, you can watch the reactions of students as they reach that problem. Many of the students seem more relaxed for the remainder of the test as well. And, while the guy was a math professor, you haven't taken a physics class until you've done video analysis of a watermellon dropped from the 10th floor of a building in order to calculate g.
