If you read 1Cor 6:9, well all those of practice these things, will not inherit of the kingdom. Everybody here in this forum, either were or are still Jehovah Witnesses, so to a certain extent, most of us still believe in the bible. They only argue about its interpretation. Wordly people as we were taught, do not know their bible, nor God's will. So for them, it is normal to act the way they acted at that party you were talking about. As long as you read the bible and attend J.W. meetings, you will never find it normal to participate in such a party, where immoral things go on. Everyone is free to decide for himself what kind of life he or she wants to live. If you attend meetings, and go to worldly parties, then you are living a double life, and will have to choose one day which master you want to serve.
On the other hand, if you choose to quit being a witness, or act like one, then after time, you will get used to other values and will blend in, and be just like the others. It's a period of transition.