Fly in the face of something
Definition 1 of 1
Pro Tip 1/3Strong Opposition
Use it to describe an action or belief that directly opposes a common understanding or expectation. 
Refusing to use technology flies in the face of modern society.
Pro Tip 2/3Rebellious Tone
It often carries a tone of rebellion or deliberate nonconformity. This may imply criticism or disapproval. 
Wearing casual clothes to a formal event flies in the face of traditional dress codes.
Pro Tip 3/3Emphasize Surprise
Use to express surprise or astonishment that someone would so boldly contradict accepted notions. 
Her statement flies in the face of what we considered historical fact.