No one is mocking the idea that there is a place for self driving cars, whether privately owned or pooled for collective use, just that this is going to completely replace private ownerships for everyone.
As a rural resident who does most driving on rough, dirt roads and roads without lane markings, I think it would be cool to eventually have a car that could self-drive, but I don't expect them to work for me anytime soon. Electric cars, similarly, aren't practical for rural usage—there is nothing comparable to the ease of throwing a few more cans of gas into the back to extend your range when driving long distance in a remote area with no fuel/power. As batteries and range keep getting better, they become more useful for some rural users, but still not so much for long distance backcountry travel.
Furthermore, people who choose to live in rural areas end up needing to be more self-sufficient mechanically as well, able to repair vehicles themselves. Electric and self-driving vehicles are and will continue to become decreasingly user-serviceable. That alone is a big reason for me to hesitate in ever wanting one. The world is moving away from repairability, and for people who need to be able to fix things ourselves, or who believe that it's the right thing to do, that forces us to avoid adoption of certain newer technologies. But now I'm getting into a whole new subject.