I'm convinced a lot of the fuck car people are people in their 20s with no kids who live in the city where they can heavily rely on good public transport and not have a need to travel too far.

I totally get the sentiment but it's just not practical for a lot of us. To get people away from cars the local authority would need to practically fill the roads with small extremely regular buses that go all over the place. You'd never wait more than a couple of minutes outside your house for a bus to arrive to go somewhere.