I don't know about you, but I never had the nerve to stay out all night with a boy when I was growing up; much less when I was 14.
Nope, my dad would have killed ME if I even thought about spending the night out at 14. Couldn't even go on a date till 16, and even then my little sister had to go along. I doubt these parents encouraged her to spend the night out either, hence the fight and subsequent murders.