If the net result of a tax is that a poorer family pays a higher percentage of their overall income in taxes than a wealthier family pays in taxes, then its regressive. Why on earth would you prefer a sales tax to an income tax anyway? With a progressive income tax, your taxes are low when you start out working and you are not making much money. They increase with your income, but then when you are raising kids, they get lower again. Once your kids are out of the house they go up proportional with your income, then when you retire, and your income is limited, they get very low. I mean if I were going to design a tax system that is pretty damn optimal.
In contrast, property, sales, and personal property taxes work nothing like that. Property and sales taxes have a higher burden on you when are raising kids (and thus buying more and needing a larger home) and in retirement than they do at any other point in your life.
Personally, I would rather the government tax my income sufficiently to pay for government services, schools, infrastructure and so on, and just leave me alone after that. If it was up to me, income taxes would be the only kind of tax we would have.