If I'm in a car and hit the gas, an outside observer on the ground sees my car accelerate to some speed, and given the mass of my car and the horsepower of my engine, this obeys Newton's second law.
From my standpoint, the principle of relativity says I can claim the car is stationary and the Earth and everything on it is moving backwards. But that seems to require saying that my 300 hp car (say) is pushing the entire planet from 0 to 60 mph in 15 sec, or whatever it may be. In clear violation of Newton's laws. So it seems like I would know my point of view to be false, and the Earth is a truly "preferred" reference frame.
What am I missing?