insist on doing something
phrasal verb with insist verb [ I ] uk/ɪnˈsɪst/ us/ɪnˈsɪst/
C1 （即使惹恼他人，或被人认为对自己无益，依然）执意做（某事）
to keep doing something, even if it annoys other people, or people think it is not good for you
I don't know why you insist on talking about it. 我不知道你为什么要坚执意讨论此事。