Be grateful, consider the kindness you have received from God and people. Remember yor time of need, and what you went throough, and decide to help someone who is helpless. It will do them good, just the way it did you good.
If you struggle with being kind to someone who is rude to you, remember it’s always better and more rspectabl to take the honor road = if someone is slinging mud at you, they make their hands dirty. Do you want to make your hands dirty too? You know better than that. Ignore them, leave their company, and act more mature than they do. Eventually, this will open their eyes….and guess who’l be boss now?