If you don't give out decency into the world, don't expect decency back. You don't lose anything by being nice to people.
In the rec.skiing.alpine mess, I tried to be reasonable with people, but those with whom I disagreed took me as an enemy (a lesson I should have learned). Scott Abraham himself threatened me personally and his "lawyer" Bert Hoff (claimed to be Yale Law graduate, but he was obviously horrible at law) threatened to go to my employer. I beat him to it by telling my supervisor what was going on, including a long lesson on what usenet was.