the.com/egotism

Confusing the volume of your opinions with the quality of your evidence.

means The habit of over-rating your own importance, abilities, or opinions — and showing it.

from Rooted in the Latin 'ego,' simply 'I.' The word emerged in the 1700s as a deliberately clinical coinage, first used to describe writers who couldn't stop inserting themselves into their own prose — an excessive, droning use of 'I.' From that narrow literary complaint it widened into its modern sense: any excessive self-regard, not just the grammatical kind.

not narcissism
narcissism needs admirers, egotism just needs a mirror
root cause
treats your own perspective as the control group
tell
answers every question with a story about itself
cure rate
low, because the patient grades its own progress
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