A true Christian would not do what you described. I would not want to live near that person either! The 10 commandments were given to the nation of Israel, then are summarized and repeated by Jesus in the New Testament thereby fulfilling those of the Old Testament. However, God recognized that, by virtue of us being sinners, no one can perfectly obey the 10 Commandments, and are thereby in need of Gods perfect and perpetual Mercy and Grace that can only be found by the acceptance, faith and following of Jesus Christ!