I was using the so-called “courtesy flush” long before I knew it had a name. Flushing something particularly odorous quickly or flushing to mask the sound of flatulence are common reasons for the courtesy flush. You might use this tactic at a friend’s house or even at home, but most often it’s used in public bathrooms, especially those that are not well-trafficked.
Anyone who has inflammatory bowel disease (IBD) has used the courtesy flush. Maybe there are some who couldn’t care less what the person in the next stall hears or smells, but others feel some embarrassment.