Synonyms for Carping (same or very similar meaning)
WordNet sense 1 (persistent petty and unjustified criticism):
faultfindingWordNet sense 2 (quibbling over insignificant details):
nitpicking, quibbling, caviling, pettifoggingWordNet sense 3 (marked by a tendency to find and call attention to errors and flaws):
criticalFrom the ODE community, based on WordNetadd/edit