sour grapes

/S AW1 ER0 G R EY1 P S/
noun
  1. 1

    Grapes that are acid due to lacking maturity

  2. 2

    Things that somebody pretends to despise because he/she cannot obtain or have.

  3. 3

    A putting down or expression of disdain about something that one desires but cannot have.

    I think his comments about that new car are just sour grapes because he can't afford it.

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Source: https://en.wiktionary.org/wiki/sour%20grapes