bête noire       
noun [ C ] uk/bet ˈnwɑːr/ us/bet ˈnwɑːr/  bêtes noires /betˈnwɑːr/ /-ˈnwɑːr/
 令人厌恶的人(或物)
a person or thing that you dislike very much or that annoys you
  My particular bête noire is cigarette butts being left in half-empty glasses. 我特别讨厌有人把烟头丢在半满的水杯里。