The antonyms for the phrase "buddied up" could be "isolated," "excluded," or "unattached." To be isolated means to be separated or detached from others, while to be excluded means to be deliberately left out. Additionally, being unattached suggests a lack of close relationships or connections with others. These antonyms reflect the opposite of the more positive connotation of "buddying up," which suggests forming closer bonds with friends or colleagues. These terms can be used when one is intentionally distancing themselves from others or in situations where they do not feel comfortable connecting with others.