Well, on the surface, that comment is accurate. But our tax system, though based on a sliding scale, is not a simple sliding scale.
The problem is (or so I've heard) that the average person who makes, say just 25k a year, pays:
15% federal tax (gross)
8% state tax (gross)
7.65% fica (gross)
say pays 7k in rent or home loan
and of the remaining $10,337.50 remaining, must purchase gasoline, heat, food etc. All of which is taxed, except for the food.
So you can see how one making just 25k per annum can be taxed 40%.
The average person who makes, say, 300k a year, pays:
35% federal tax (gross)...but wait. We must first deduct losses, deductions, depletions, depreciation, credits, etc., etc., etc. Whereby, we can now get the gross income down to say 50k.
One can easily see the inequities in the current tax structures.