agonismn.
An argument or debate in which the opponents use knee-jerk aggression instead of reasoned analysis.
Example Citation:
"Too often, in her view, American culture engages in 'agonism': ritual verbal combat, in which people reflexively boil down complicated questions to two crudely polarized positions which are set in conflict with one another."
—Jonathan Rauch, review of The Argument Culture, by Deborah Tannen, The Los Angeles Times
