Even though society's standards continually change and would not always be acceptable to us as Christians, there are still some behaviors which society considers to be unacceptable. Acceptable behavior is that which conforms to the criteria. As Christians, our goal is the development of Christ-likeness in our lives. Christ is the standard, the criterion, that determines the acceptability of our lives. They want things to function in an orderly manner.
Many rules are simply an effort to help things run smoothly in a community of people.
Young people need to learn to live with consideration for the whole, not simply themselves. They love us and are looking out for our best interest. Experience has taught them that certain actions have undesirable consequences. In an effort to protect us from those consequences, they restrict us. They are concerned that we have a good reputation before those who see us.