antipartisan 

Someone who opposes political party affiliation outside of elections. Antipartisans believe that political party affiliation and labeling among people, organizations, and news outlets promotes ignorance and amplifies division. They believe that political parties manipulate emotions and statistics to support an agenda. Basically, political independents on steroids.

Bob: "Tbh I hate the political party system."
Jeff: "Oh, you must be an antipartisan."

antipartisan by JP the ENFP June 14, 2022