insult vs slap in the face

insult

noun
  • Something that causes offence (for example, by being of an unacceptable quality). 

  • Something causing disease or injury to the body or bodily processes; the injury so caused. 

  • Action or form of speech deliberately intended to be rude; (countable) a particular act or statement having this effect. 

verb
  • To be insensitive, insolent, or rude to (somebody); to affront or demean (someone). 

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 insult and slap in the face occurred in a corpus of books? (source: Google Ngram Viewer )