I think trying to get them to understand (hopefully from a young age) that you only want the best for them. You aren't doing things to spoil their fun but instead you are worried about them hurting themselves and the consequent A&E visit, the problems showering with a broken arm/leg and the physiotherapy that ensues. My two watch fail army videos but they don't see the aftermath of the injuries.
Re education/sleep/eating that again you are trying to keep them healthy so they don't have issues concentrating in class, that you never want to see them struggle financially (we have a good life, by contrast my SIL does not and they see it.)
That imagine if I suddenly decided I couldn't be arsed to go food shopping or go to the bank to get cash out, stopped doing laundry and ironing their uniform. Why is it that they get to cop out of stuff? We never did chores for money in this house, it isn't optional and they started very young.
Basically for us it has always come down to I get what I want then you get what you want (within reason) so shopping wise, I need to take you to get school shoes, you need to come at it with a positive attitude or you will not be allowed what you want ie gaming/tv/out on bike etc when we get home. This is the same as the real world, your boss wants X you want Y which is money.
As a parent all you need to provide is a bed, some food and some clothes, anything else can be restricted or taken away. And yes I have teens, sons who are 16 and 13.