"Red rag" is a phrase commonly used to describe something that provokes extreme irritation or annoyance. However, there are several other synonyms for this phrase that can be used to convey the same meaning. Some common alternatives include "hot button," "pet peeve," "irritant," "trigger," "annoyance," "exasperation," and "bothersome behavior." Whether it's a particular topic of discussion, a specific person, or a habit that drives you crazy, these words and phrases can help you express your frustration and annoyance more effectively. So, the next time you encounter a "red rag," remember that there are several other words you can use to express your feelings.