Solipsism

(noun) the theory that only the self only exists because it’s the only thing that can be proved to exist; extreme egocentrism

1. June was shocked by the school board’s solipsism when they replaced her sons’ science text books with books that taught opinion-based creation theory.

2. June thought Ward’s solipsism was getting out of control when she discovered that his apartment was full of framed headshots and portraits of himself.