This is a post about anachronistic language that hasn't yet caught up with reality.
For example, on the news you'll often see a clip that the newsreader says was "caught on tape" even though, I'm sure, most of the time anymore it wasn't captured on tape at all, but more like on a memory card or directly into a computer's memory. No tape involved at all.
Here's another one: We all refer to our iPhones, Galaxies, EVO's, etc. as "phones" when, in fact, they are handheld radios.
Got any examples of your own?
You drive in a 'Parkway', and park in a 'Driveway'.
To be noble, a gentleman or a lady refers to behavior or disposition today. These originated as actual nobility in the British social class system. A gentleman, for example, indicated the landed gentry: a man of wealth, high birth and good social standing who did not need to work for a living.
Telling people (of the lower classes) to 'act like gentlemen' was a literal reference to members of a higher social status as models for 'proper' behavior, based on the idea that one should aspire to emulate his betters.