If you're able to fully manage all of your personal expenses as a high school student, and I do mean all of them, then there's nothing wrong with saving the excess. But preferring that your parents handle the dirty work while you "save" is a bad idea.
I don't see anything wrong with parents covering most of the bills if you're still young. if you're still living with them like at 25 years old then yeah you should contribute much more, but if you're 16 and in high school then I don't see the issue
the kid should be expected to pay car insurance, pay for some or all of the car, gas, etc. and do chores around the house, but expecting them to pay several hundreds of dollars of bills every month seems a little ridiculous.