踩尾巴

cǎiwěiba ㄘㄞˇ ㄨㄟˇ ˙ㄅㄚ

    • to touch on someone's weak point and offend them

Character by character

Saying俗语俗語

Idiom惯用语 · Widely known

Literally
step on someone's tail
Meaning
To touch on someone's weak point or fault and offend them.

Sources