Stop acting like a molehill mountaineer over this small mistake.
molehill mountaineer
idiomA person who habitually exaggerates or overemphasizes minor issues.
Origin
disputed originFrom the idiomatic expression make a mountain out of a molehill.
He is such a molehill mountaineer that he called an emergency meeting just because the printer ran out of paper.
The manager, a notorious molehill mountaineer, turned the minor clerical error into a crisis that consumed the entire afternoon.