backhanded compliment vs slap in the face

backhanded compliment

noun
  • An insult disguised as a compliment; a compliment which can be interpreted as an insult. 

slap in the face

noun
  • Something unexpectedly said or done which causes shock or offense; an insult, rebuke, or rebuff. 

  • Used other than figuratively or idiomatically: see slap, in, the, face. 

How often have the words backhanded compliment and slap in the face occurred in a corpus of books? (source: Google Ngram Viewer )