your, his, etc. bête noire
A person or thing that one strongly dislikes. This phrase means "black beast" in French. People who chew loudly are really my bête noire. She's trying to get her shift changed because night work is her bête noire.
your, his, etc. bête ˈnoire(from French) a person or thing that particularly annoys you and that you do not like: Edward was furious when he discovered that he would be working with his old bête noire, Richard Watkins.
The meaning of the French phrase is ‘black beast’.