Do somebody the courtesy of doing something
Definition 1 of 1
Pro Tip 1/3Respectful Gestures
Used when someone goes out of their way to show respect or politeness through their actions. 
He did the courtesy of standing up when she entered the room.
Pro Tip 2/3Social Expectations
Often used in situations where social norms or expectations suggest that a certain behavior is appropriate. 
She did me the courtesy of sending a thank-you note after the dinner party.
Pro Tip 3/3Cultural Sensitivity
Can indicate awareness of and sensitivity to someone’s cultural norms or values. 
They did us the courtesy of removing their shoes before entering our home.