If they are not Christians they are going to try to pull you down with them.  That is human nature.  I remember the lesson my husband gave our children when they were in their early teens.  We were steaming crab and they were alive.  When you put crabs into a pot of boiling water they try to climb out of the pot.  The ones that were on the top who almost made it out were pulled down by the crabs closer to the bottom.  Rather then helping one of their own get freedom, the other crabs pulled him down into the boiling water.  My husband told the our kids that is how people are.  They will pull you down to their level if you allow them to.  You need to be strong in your values and what you have been taught and never let anyone pull you down into the boiling water.  That is why the Bible teaches to not have close relationships with unbelievers.  We have nothing in common with them other then the fact that we are humans.  Jesus put it very well when he said “what fellowship does light have with dark?”  That doesn’t mean that we are top mean.  We just shouldn’t have them as close friends.  God bless you!!!:):)