[wfunction]

Is not saying hello when you see someone that you would normally be expected to say hello to not considered "rude"? It is to me, but it's not obnoxious...

[cperciva]

There's a reason I said "more along the lines of" -- I was having trouble coming up with a definition which was precise without being circular.

In any event, I'm sure you can agree that "rude" no longer means simply "unsophisticated".