PS: I don't suffer fools gladly...:-)
My principal told me to "disagree without being disagreeable" when I object to the leftist claptrap teachers spread in the school. What I explained to him (and he later acknowledged that I'm right) was that lefties pretend to adhere to that rule, but THEY are the ones who get ugly and personal.
I find the best weapon is to be amused by their naiveté, then mention some easily verifiable, but not in the mainstream facts, like the weapons being moved to Syria, when they protest, dismiss them as uninformed. Nothing gets under their skin more than being laughed at, especially politely, for their ignorance. They like to think of themselves as “the informed intelligencia”, nothing motivates them to learn like knowing you think them “Provincial”.
Enjoy your conversations with liberals, if life isn’t fun, your doing it wrong.. /Philosophy