So start by refraining from phrases such as "flying monkeys" or "bushbots" in your responses, as that just spreads the flaming, and can raise the hackles of otherwise civil posters. Ask the flamers to debate instead of just spewing insults. I've found the flamers will generally just slink off and try and find a food fight somewhere else if people stand up to them...
Fair point... I don't mind much being called a "Bushbasher," and I've got some friendships among some who good-naturedly call themselves "Bushbots," so I guess I sometimes forget myself.
Apologies to any I've offended.