The idiom "make a monkey of" means to embarrass or make a fool out of someone. There are several other phrases that can be used interchangeably, such as "make a fool of," "mock," or "ridicule." "Humiliate" and "disgrace" are other synonyms that convey a similar meaning. Other related phrases might include "put someone down" or "belittle." No matter which phrasing is chosen, it's important to remember that bullying or harassing others is never acceptable behavior. Instead, treat others with respect and kindness, and politely address any issues that need to be resolved.