Final answer:
The claim that Postmodernism necessitates a grand narrative or metanarrative is false. Postmodernism rejects universal truths in favor of individual perspectives and multiple truths.
Step-by-step explanation:
The statement "Postmodernism says that we can't exist without our big story, or metanarrative" is False. Postmodernism is characterized by skepticism towards grand narratives or overarching theories that claim to explain all aspects of reality or human experience. Instead, postmodernists believe in relativism, the idea that reality is constructed by individual perspectives, and that there is not a single narrative that is universally true for everyone. This philosophical stance recognizes the plurality of truths and challenges the concept of objective reality. Postmodernism advocates for a multiplicity of narratives and rejects the notion that there is one binding, unquestionable metanarrative that everyone must adhere to.