Dic: fly in the face of, fly in the teeth of

14. PHRASE : V inflects, PHR n
If an action or belief flies in the face of accepted ideas or rules, it seems to completely oppose or contradict them.

• scientific principles that seem to fly in the face of common sense.

.... Cobuild

also, fly in the teeth of someone or something

• This idea flies in the face of everything we know about matter and energy.
• You had better not fly in the face of the committee.

..... http://idioms.thefreedictionary.com/fly+in+the+face+of