learn to set standards for yourself and it's okay to cut off from people who try to belittle you or treat you below the standards you have set for yourself
Every pastor is sent to the unchurched. The gimmick of "who you are called to preach to" needs to stop being used to enable clear disobedience and defiance of the word of God.
GOD is against any form of willing marking of the skin but in case but by all means support your friend.