I'm not going to allow my children to eat junk food, watch tv, or play video games
Why would you do that? Do you think that will help your children?
If they don't wake up and start making good choices, I'll put them in a school where they'll learn.
If you want to set those kind of rules. Just be fair, so the children can tolerate your decision.
I don't have to fucking listen to you.
You don't, and I think that you're free to do whatever you want. Sometimes it is good to set down ground rules for your children if you want them to grow up happy and healthy.