overreact
v.to respond to a situation in a way that is much too strong or emotional. You do this when a small problem makes you feel or act like it is a huge crisis.
v.to respond to a stimulus or situation with an intensity or emotion that is disproportionate to the actual circumstances. Often implies an unnecessary or excessive reaction to a minor event.
“Don't overreact to the small mistake.”
“He tends to overreact to every little criticism, even when the feedback is meant to be constructive.”
“While the initial data suggested a significant downturn, the board was accused of overreacting by halting all new investments before a full analysis of the market was complete.”
“It will take a far larger decrease in violent crime to make up for the increases of the previous decade.” All of which indicates the public is not overreacting to crime.”
“Others say it was a joke and they’re overreacting.”
From over- + react.
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.