"Read the riot act" is a phrase commonly used to convey the idea of scolding or warning someone in a stern and threatening manner. However, there are many antonyms that can be used instead of this phrase to convey different tones and attitudes. Some of these antonyms include "praise," "compliment," "applaud," "commend," "encourage," and "support". These words convey positivity and appreciation, rather than a negative or threatening tone. Using antonyms for "read the riot act" can help to create a more positive and encouraging environment, while still conveying important messages and feedback.