cut (someone) to the quick
US /kʌt ˈsʌm.wʌn tu ðə kwɪk/
UK /kʌt ˈsʌm.wʌn tu ðə kwɪk/

1.
to deeply hurt someone's feelings
:
•
Her harsh words cut him to the quick.
•
The criticism cut her to the quick, even though she tried not to show it.
to deeply hurt someone's feelings