backtalk vs commenting

backtalk

noun
  • Verbal impudence or argumentative discourse, given in response. 

verb
  • To respond to in an aggressively disputatious, often sarcastic or insolent manner. 

commenting

noun
  • The making of a comment; commentary. 

How often have the words backtalk and commenting occurred in a corpus of books? (source: Google Ngram Viewer )