vitriolic - VIT-ree-ALL-ik - sarcastic, caustic, disdainful
Example: Regarding negative reactions to the president's health care proposal, satirist Brian Unger wrote the vitriolic summary, "A lot of us are a combination of these things: too busy, lazy, a bit stupid perhaps, lucky, unsympathetic, in-denial, really rich, hypocritical, selfish - and patriotic."