Too much of the internet endorses too often the style of the Brooklyn Debating Society: "Fuck you!" "No, fuck you!" It's an old trick that politicians especially love: "When you have a weak case, abuse your opponent."
My googling also brought up ON ARGUMENT - Iftekhar Sayeed:
In the Gulistan, Sheikh Sa’di says: “Galenus saw a fool hanging on with his hands to the collar of a learned man and insulting him, whereon he said: 'If he were learned he would not have come to this pass with an ignorant man.'”To close, Monty Python's "The Argument Clinic":
“Two wise men do not contend and quarrel,
Nor does a scholar fight with a contemptible fellow.”