He didn't even have the 'common courtesy' [=he was not even as polite as people can usually be expected to be] to say goodbye when he left.
He picked up the airport 'courtesy phone' [=a telephone that customers can use to call the company that provides it] to call for a car.
They paid a 'courtesy call' on the ambassador. [=they visited the ambassador because it was the polite thing to do]
(..) -Are you a peter puffer?. -Sir, no, sir. I'll bet you would fuck a person in the ass... ...and not even have the goddamn common courtesy to give him a reach around. I'll be watching you. Did your parents have any children that lived?. -Sir, yes, sir. -I'll bet they regret that. (..)1987 Full Metal Jacket