Context
Dirt has different meanings to different people, within the RAF no ones dining out would be complete without some entertaining faux pas from the past to balance the compliments of a job well done.
Olive oil on its own versus a dash of vinegar for a dressing etc etc.
Rather that than the US style endless over the top bigging up of someone's career to the point where it becomes embarrassing.
By the way are you Mike Rondot the aviation artist? Good work.
Regards Bigpants