When people say "fuck cars", they usually mean "fuck car-centric infrastructure" (though some do really hate cars).
Having a diverse set of options focusing on walkability and public transportation doesn't mean the elimination of cars. It just means that everyone isn't forced to use a car to do just about anything. As a car-lover myself, I hate sitting on traffic. Makes the car I carefully chose to be just a glorified AC box. I hate sharing the road with 90 year old geriatrics, kids taking their parent's car for a joyride, and bar-hopping drunk drivers. In a non-car centric neighborhood, they could all just walk/take public transpo to buy eggs, go to the arcade, or go home safely when they're drunk.