pick-fault

From pick +‎ fault.

pick-fault (plural pick-faults)

1. (obsolete) A critic; a censorious person.
   • 1823, Charles Molloy Westmacott, Cockney Critics, page 17:

     The foe of genius, learning's pest, / A pick-fault, scurvy hack at best

• faultfinder; See also Thesaurus:complainer