It took untold generations to get you where you are. A little gratitude might be in order. If you're going to insist on bending the world to your way, you better have your reasons.
Children totally accept — and crave — family rules. “In our family we have a rule for X” is the only excuse a parent needs for setting a family policy. In fact, “I have a rule for X” is the only excuse you need for your own personal policies.