When someone is being extremely egoistic, they think/speak/act from their tower of self-centeredness
Sam: If I cannot get it, I don't know how anyone can get it.
John: Ok Sam, let me know when you get down from your tower of self-centeredness
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His tower of self-centeredness is so high that he looks at other people as ants
Self-centeredness is defined as being preoccupied only with oneself or one's own affairs. It is more of being too interested in yourself and not caring about the needs or feelings of other people. -Emeasoba George
Self-centeredness is synonymous with self-obsession.