ㄉㄤˇㄊㄨㄥˊㄈㄚˋdǎngtóng‑fāyì

党同伐异
dǎngtóng‑fáyìㄉㄤˇ ㄊㄨㄥˊ ㄈㄚˊ ㄧˋ
  1. 自己意見相同互相偏袒自己意見加以攻擊學術派別鬥爭泛指一切團體鬥爭

to be narrowly partisan, to unite with those of the same views but alienate those with different views