We could define several kinds of people who might have varying degrees of interest in carfree living.
Some could be called car-optional if they have developed any workable alternatives to driving, even if they don't use those alternatives regularly. For example, people who take the time to learn to use a local public transit system. Or those who scout out a bike commuting route and ride it occasionally. These folks certainly understand what we're talking about with respect to infrastructure issues and other carfree challenges.
Others have simply become aware of the nature of car dependency and the existence of alternatives. They might not use any form of alternative transportation themselves, but they are an important part of our carfree support system (such as it is). They are the store managers who think to provide bike racks. They are the tolerant bosses and they are the drivers who pass us safely on the road. Edit to add: And thank goodness for those unknown heroes in the department of transportation and city planning meetings who speak up at critical times and ask, "But what about the bikes?"