Because it's one of my personal obsessions, I read lots of newspaper site comments to articles about public transits. And it's usually a bit depressing because even people who are notionally pro-public transit (my position, feel free to disagree) usually have no idea what they're talking about. I don't mean that they fail to get an A+ in transit nerdery, I mean they just don't have any personal experience with actually using it. It's alien to them. So many people are obsessed with shiny new technologies with dubious benefits (maglev! PRT!), or think there should be more subways in the suburbs, or really don't understand the difference between inter-city rail systems and intra-city systems (maglev to the airport!!!).
And of course. In most of the country, people just have no daily experience with it. It's just an idea, and one they don't understand.