"Gets in with" is a common phrase used to describe someone who becomes involved or friendly with a group or person. Some antonyms for "gets in with" would be to "stay out," "exclude," or "avoid." These words convey a sense of resistance or apathy towards the act of trying to integrate oneself into a social group. Other antonyms could include "reject," "disapprove," or "disassociate," which suggest a deliberate and active decision to distance oneself from a particular group or individual. Ultimately, the opposite of "getting in with" implies a level of independence or self-sufficiency, where an individual does not feel the need to conform to other people's standards of acceptance.