Yeah, they usual shut up because they realize there is no use talking to a dumbass liberal/progressive.
Seriously I've had dumbasses try that approach. The counter argument is obvious.
Dumbass: We are all marxist because everyone uses roads, firedepartments, etc.
Me: I thought you said Obama wasn't a marxist and anyone who said he was , was stupid.
Dumbass: Yeah, that's right. He isn't a marxist and anyone who says he is , is stupid.
Me: So we are all marxist for using things like roads which have been around for thousands of years before Marx except for the president who wants to take over major industries like energy production and health care.
Dumbass: Yep, aren't I a super-genius
Me: Yeah, sure buddy. I've got to get to work now.
At which the liberal takes a few bong hits and posts on DU how he "put the ocnservative in his place".
sorry about the double post.