I don't think you are over reacting. My answer would have been, what do I need to take? Do I get to wear my gootie pajamies? I would be packing my bag and meeting them at the door of the friend's house to visit too.
Of course, this one didn't happen to me. My daughter's dates to these things turned out to be students of mine. All I had to say was "Curfew is ___. Have her home if you want to pass my class." Worked well. Of course, it helped that Dad looked really mean and frowny when boys picked her up (he wanted to lock her in her room until she was 35). Now she's married off and I don't have to deal with it anymore.