To say that a car is a liability is too simplistic and to say "the moment you consider a car is an asset, you actually can't afford to own" is a bit too ignorant. A car is not a straightforward liability, it is an asset but a depreciating asset.

You can earn money through Uber from having a car, that means your car is an asset for you.

If you happened to have a car so rare that can be sold mutiple fold it's original price makes the car an asset to you.

So it really depends on why you have/purchase a car that'll define is the car a liability or an asset.