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You can bless them through pray since you do not know them well then you really cannot go up to them and say a pray they will think you are strange or it may give them even more reason to make derogatory statement. What you could to do pray to God to humble them and teach them passion for others. I think the Bible meant to bless them through pray. The saying "Misery loves company" comes to mind when talking about people that talk about you or make untrue statements. You can not stop them from saying what they want to say but you can pray for them to not judge thus be judged.