An exaggerated reaction is when someone's response or behavior is more intense or dramatic than what is necessary or expected in a given situation. It means they are overreacting or blowing things out of proportion. Full definition
Why else would religious people have such exaggerated reactions to people who question their beliefs? (nakedpastor.com)
Bad news looms disproportionately large in the mind, which encourages exaggerated reactions, Galinsky says. (fortune.com)
Whether Woodhull exaggerated his reaction, appearing onstage with her surely would have raised grave questions, especially among Beecher's sisters and their friends. (bookbrowse.com)