If you are a new man, a new creation in Christ, then why do you allow an accusation from your past to define you? There is only one accuser of the brethren. Stop worrying or thinking about what someone from the past throws in your face and take hold and believe the truth of who you are now in Christ. They cannot put Jesus' Blood back in His body and take Him off the cross with their accusations and they can't take that Blood covering and forgiveness off of you either. You are not your past, you are innocent, you have been washed clean. Is that not what He says in His word? Let God be true and that accusing man a liar. Who cares if they don't understand or like it, you serve and trust God, not man or satan.