This is something that came up indirectly in a previous discussion at some point in the last month or so in Hot Topics-- I think what this story illustrates is that there is still very much a perception of social class in America that pertains to what someone does, and in particular service people, particularly food service people for some reason, are treated as beneath almost everyone else. Anyone who's worked in food service will pretty much know what I mean, people really talk to you sometimes as if you're from a separate subspecies just because of the job you're doing. If anyone has read any of the books that the series "True Blood" is based off, those books really captured a lot of the bias and bigotry that people have towards food service workers, as the main character is telepathic and works as a waitress, and can always hear what people are thinking about her.
And apparently even pastors aren't immune. Despite similarly living "in a field of service", the connotation of where they rank in the social order is just nowhere near someone like a waiter or waitress.