一竹篙打一船人 [－－－－－－－]

Jyutping jat1 zuk1 gou1 daa2 jat1 syun4 jan4
Pinyin yī zhú gāo dǎ yī chuán rén

Definitions (CC-CANTO)
  1. a pole hits a boat of people, which means one holds onto someone's wrong and thinks the rest of others are the same
Definitions (粵典–words.hk)
  1. 語句
    以少數​人​嘅​行​為​否定​所​屬​嘅​成​個​群​體
    to overgeneralise in assigning blame; to blame a whole group of people for the mistakes of a few