insolence vs red rag to a bull

insolence

noun

  • Insolent conduct or treatment; insult. 

  • Arrogant conduct; insulting, bold behaviour or attitude. 

red rag to a bull

noun

  • Something that will enrage another particular person. 

How often have the words insolence and red rag to a bull occurred in a corpus of books? (source: Google Ngram Viewer )