Touch one on the raw - Idioms by The Free Dictionary
touch (someone) on the raw (redirected from touch one on the raw)
touch (someone) on the raw
To mention a topic that causes one to feel agitated or self-conscious. Primarily heard in UK. I accidentally touched Vanessa on the raw by mentioning her new haircut—apparently, she's really unhappy with it.
touch someone on the raw upset someone by referring to a subject about which they are extremely sensitive.
catch/touch somebody on the ˈraw (British English) upset somebody by reminding them of something they are particularly sensitive about: She touched him on the raw by criticizing his driving.