If you treat convention with disdain, are you flouting or flaunting the rules?
How to Remember It:
Think of whistling - or actually, playing the flute - instead of doing what's expected.
Why? Because flout probably originates in the Middle English word flouten, "to play the flute." It's not clear how a word for playing the flute evolved into a synonym of mock and insult (the original meaning of flout), but here's a guess: in the hands of some entertainers, the flute can project a teasing, even mocking, carefree air.
By the way, using flaunt in sentences like the one above is now standard, although many folks still consider it incorrect.