There are many different synonyms for the phrase "rubbing it in." Some common alternatives include "taunting," "flaunting," "showing off," "boasting," "gloating," and "bragging." These phrases all convey the idea that someone is purposely drawing attention to their success or good fortune in a way that is meant to make others feel inferior or unhappy. Other possible synonyms might include "needling," "prodding," or even "harassing," depending on the context in which the phrase is being used. Ultimately, the important thing is to choose a synonym that accurately captures the tone and meaning of the original phrase, and that helps you to effectively communicate your message.