"Paints town red" is an idiom that means to go out and enjoy oneself flamboyantly, often while causing a commotion. Antonyms for this phrase could include phrases like "keep a low profile," "lie low," or "fly under the radar." These phrases suggest a sense of caution, restraint or reserve, and would typically be used to describe someone who is trying to avoid attention or keep a low profile. Other antonyms for "paint town red" might include expressions like "behave oneself," "exercise moderation," or "act with restraint," all of which suggest a more reserved and cautious approach to socializing.