#detractor__disparager__depreciator__knocker  one who disparages or belittles the worth of something
  supertype:  #cynic__faultfinder  someone who is critical of the motives of others
  subtype:  #defamer__maligner__slanderer__vilifier__libeler__backbiter__traducer  one who attacks the reputation of another by slander or libel
  subtype:  #hatemonger  one who arouses hatred for others
  subtype:  #muckraker__mudslinger  one who spreads real or alleged scandal about another (usually for political advantage)

No statement uses or specializes #detractor; click here to add one.