Dear Miss Manners: Sometimes I see patrons in a store or restaurant peer at the service employee's name tag and say something like, "Hello there, Tiffany, how are you today?" It always comes out with this forced conviviality, as if to say, "Look, everyone! I'm a good, egalitarian person treating the lowly server as a person. Isn't that great of me?"
I think it actually says, "You have such a menial job that you're forced to wear a stupid name tag, so I know your name and feel free to use it even though I don't know you — but you don't know my name because I'm a higher-class person and get to dress the way I want."
I think name tags are just so you know whom to refer to if needed, as in, "I think Tiffany is our server. Could you ask her to bring the check?"
Am I right to see this as presumptuous behavior?
Gentle Reader: The presumption in the greeting you mention is not in using Tiffany's name, but in asking the waitress how she is "doing," a question that is not relevant to the business at hand.
Miss Manners has no objection to using a form of address that has been supplied by the addressee, even if, in this case, it may technically have been Tiffany's boss who chose the form. She does agree that first names in this context are an invitation to mistreatment.
Cupcake advisory
Dear Miss Manners: My fiancé and I are having a cupcake tree instead of serving sliced cake at our wedding, which will be held at our church, with all members and their families invited.
A few hundred cupcakes are about as expensive as the typical wedding cake, and are ordered with the number of attendees in mind, but there is typically no server and guests can take one when they desire.