Thats been proven false.
I've noticed many times, relating to different topics, on different forums, that a conservative will do that 'passive-aggressive sarcasm snark' thing that they _love_ doing, and then a fellow conservative will take them literally and start arguing with them.
It really seems as if 'weak sarcasm' is the standard rhetorical 'mode' for conservatives these days. I have a theory that it's because they know their actual positions are hard to defend, so by expressing them in that sarcastic manner they can avoid having to state directly and clearly what they actually think, and so avoid the absurdity of it being too obvious.