kill someone with kindness
US /kɪl ˈsʌm.wʌn wɪð ˈkaɪnd.nəs/
UK /kɪl ˈsʌm.wʌn wɪð ˈkaɪnd.nəs/
1.
to treat someone who is behaving badly to you in a very polite or kind way, so that you make them feel ashamed of their behavior and change it
:
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Instead of arguing back, she decided to kill him with kindness, offering to help with his project.
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My grandmother always taught me to kill them with kindness when someone is rude.