If the person still refuses to listen, take your case to the church. Then if he or she won’t accept the church’s decision, treat that person as a pagan or a corrupt tax collector.
They told you that in the last times there would be scoffers whose purpose in life is to satisfy their ungodly desires. These people are the ones who are creating divisions among you. They follow their natural instincts because they do not have God’s Spirit in them.