I would be hesitant to draw that correlation. IMO cars give you more access to third places, not less. With a car one can cover far more ground in a given 30 min drive after rush hour died down probably in every city in the world, than what one can cover in 30 mins walk and transit ride (especially when transit schedules might favor a commute into the central part of town vs some off peak trip to a random corner of town).

Say what you will about the ills of the car, but it takes a lot of specific context for them to emerge as the worst option of transport from an individual perspective. Really most of the cars ills are from their collective harms, something most can't appreciate as a tragedy of the commons sort of failing.