Abrasive means, literally,
"causing damage or wear by rubbing, grinding, or scraping."
Figuratively, it is used to describe people or things that are unpleasant or
irritating. Once upon a time, English had abrade and abrase. While abrade
remains a familiar word, abrase is rare but survives in abrasive. Both verbs
come from abrādere, meaning "to remove by rubbing" or "to scrape
off."
Sour grapes noun: Finding fault with or expressing disdain for something one cannot have. From the Aesop’s fable The Fox and the Grapes, in which a hungry fox tries to reach grapes hanging on a high vine and when unsuccessful, declares that the grapes are probably sour. Earliest documented use: 1760.