hypercritical

/ˌhaɪpərˈkrɪtɪkəl/
adjective
  1. Excessively or unreasonably critical; tending to find fault with very small or unimportant details.
    • The movie review was hypercritical, complaining about minor background details that no one else noticed.
    • She is so hypercritical of her own work that she never feels satisfied.
    • My hypercritical boss rejected my report because of one missing comma.