touch someone on the raw
touch (one) on the raw
To evoke a strong emotional reaction in someone, especially anger, sadness, or disgust. Your column must have touched the mayor on the raw, because we've been served with a defamation lawsuit from his office. I could tell he was touching Jane on the raw when he brought up her former employer and Jane went silent for a moment.
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.