faultfinding
/ˈfȯlt-ˌfīn-diŋ/
adjective
disposed to find fault : captiously, critical
critical hypercritical faultfinding captious carping censorious mean inclined to look for and point out faults and defects. critical may also imply an effort to see a thing clearly and truly in order to judge it fairly. hypercritical suggests a tendency to judge by unreasonably strict standards.
noun
petty, nagging, or unreasonable criticism