Earlier quoted context omitted.
How do renters not pay property tax? It's part of the cost of the property that the rent is based on.
Not any more than I pay corporate taxes at the groceries because it is baked into the price of goods. In some places, property taxes could impact rent, but in many places it doesn't matter because the price of rent is much higher than the cost of owning the rental (including tax). This is most true in places where you can't build more housing inventory.
Meanwhile owning a car worth even 3k is 1/10th the income of some at 30k, and many people have much more expensive cars at that income level. Worse the rate is generally higher on cars than homes. Similarly, nobody actually rich is “house rich” the way retired people are where their house is 10-30x their annual income. (500k to 1.5 million house with a 50k income.)
So, even if you exclude rental income it’s still very regressive.