Quoting the parent article is a bad idea. It promotes arguing trivial points of the article ad infinitum. See USENET circa 1995 for a discussion style that should be avoided. (Now called "Fisking.")
You're conflating three separate concepts. There's nothing inherently wrong with quoting the part you're reacting to, and it can be done without resorting to flaming or Fisking.
You are correct, but requiring or encouraging quoting promotes arguing trivial points of the article. See USENET circa 1995.