The phrase "reads riot act" is commonly used to refer to warning or scolding someone severely. Some synonyms for this phrase are reprimand, rebuke, admonish, chastise, and berate. However, if you want to use an antonym for this phrase, you can say that someone "praised," "commended," "applauded," or "complimented" another person's actions. For example, instead of "reading the riot act" to your child for not doing their homework, you could praise them for their good grades or hard work in other areas. By choosing an antonym for "reads the riot act," you can avoid harsh words and show appreciation for someone's positive behavior.