sour note

Translations
кислая нота
The meeting ended on a sour note when he brought up the budget cuts.
Встреча закончилась на кислой ноте, когда он поднял вопрос о сокращении бюджета.
Definitions
A sour note refers to a negative or unpleasant aspect of a situation, conversation, or performance that detracts from the overall experience or impression.