hypercritics

/ˌhaɪpərˈkrɪtɪks/
noun
  1. People who are excessively or unreasonably critical, finding fault with everything.
    • She stopped sharing her artwork online because the hypercritics were too harsh.
    • The hypercritics at the film festival complained about every tiny detail in the movie.
    • Hypercritics often discourage beginners from trying new things.