Solipsism is the philosophical idea that only one's own mind is certain to exist. It is the belief that the external world and other people may not actually exist, and that one's own thoughts and experiences are the only things that can be known to be real. Being in a bubble can be similar to this idea, as it involves living within a narrow set of experiences and beliefs that are insulated from external influence.

When these people do encounter someone or something that falls outside of their bubble, it can be a shock and cause them to feel disoriented and unsure. They may feel like they had no idea that anything else existed beyond their own limited perspective, and this can be a deeply unsettling realization.