Performers rely on audiences, to be sure. But audiences rely on performers too. Patrons are gambling, and investing, too. Professional performers don't expect to please everybody at all moments. Amateur performers shouldn't assume diehard loyalty beyond their inner circle.
People walk out on movies without thinking twice.
Price differential might be one reason. You're not hurting anyone by hightailing it from a movie, is the rationale. The people involved can't see you doing this. But it's mean to reject human beings in the same room. Even Rachel believes this.