If you were both backing out at the same time, then it will be considered joint fault, sometimes called contributory negligence. That means both drivers failed to notice the other driver.
It would be the car who has driven past, then reversed into you.
It is your fault.
It is ALWAYS the fault of the vehicle reversing out - as he should have reversed into the space so he could drive out forward thereby being sble to see where he was going !
It depends. If they hit you with their door, it's usually their fault. If you hit their door with your car, it's most likely your fault. That said, the burden of ensuring the way is clear is ALWAYS on the reversing vehicle.
it is the person coming out of the parking space
My fault
Backing up--it is your fault.
Yours.
the person pulling out
The car pulling from the parking space is at fault
The driver of the other vehicle. You were moving and they were stationary, hence they didn't yield right of way to you. Chance are, the parking space was private property, so a citation wouldn't be issued. Laws in your state may vary.
The vehicle exiting the parking space that did not yield to oncoming traffic.