In treating our fellowman the way we want to we need consider this.
God loves people. Even when they are choosing to rebel he loves them. Whether saint or a non believer God has placed them in your sphere of influence.
He did not do this so that you might do with them as you please. Rather the way you live and speak are to touch their hearts and attract them to the cross.
They may never receive these words or go to church and hear sermons preached there. But in your life you can live out a sermon.
What sermon are your shoes preaching? Is your life a life that shows off the world and its ways or are they up lifting toward God?
Are you living the kind of life that Satan promotes or that Jesus promotes?