Ruling
      on being friendly towards someone who is drinking alcohol, and pouring his
      drink for him
Question

                We have no choice but to
      attend parties held in the work place (a school laboratory), where people
      drink beer and other alcoholic beverages. But praise be to Allaah, we do
      not go anywhere near those drinks. However, they have a custom whereby a
      person has to be nice to the person next to him and pour drink into his
      cup (beer or whatever he is drinking), and that person returns the favour.
      So they pour juice into my cup for me. What is the ruling on my pouring
      beer into the other person’s cup? Will i be considered as one who offers
      (alcohol)?
Praise be to Allah.If the situation is as described, it is
      haraam for you to attend these parties and other gatherings with them, if
      you are not able to change the evil action, because then you are helping
      them to commit sin, or at least you are keeping quiet about it. Both of
      them are haraam. We ask Allaah to keep us and you safe.