sour grapes
Pronunciation:
noun
Definitions
Grapes that are acid due to lacking maturity
Synonyms:green grapesimmature grapesunripe grapesThings that somebody pretends to despise because he/she cannot obtain or have.
A putting down or expression of disdain about something that one desires but cannot have.
Example: I think his comments about that new car are just sour grapes because he can't afford it.