personality clash
noun [ C ] uk/pɜː.sənˈæl.ə.ti ˌklæʃ/ us/pɝː.sənˈæl.ə.t̬i ˌklæʃ/
个性冲突
a situation in which two or more people have very different characters and are unable to have a good relationship with each other
There's a real personality clash between two of the directors. 其中两位董事个性格格不入。