Body Acceptance has some aspects of being a cult. It does disregards facts, and often attack those who present them. They use clothing and hair to distinguish  themselves and alienate other people. They work hard on recruitment. They can get so enwrapped in the community they are unable to tell reasonable argument from emotional drivel. They often isolate themselves from a former friends and family because they feel attacked when confronted ("these people are so toxic").   They perpetuate self-harming behaviour in the name of "higher cause". What is missing is a charismatic leader and monetary exploitation.