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There's probably a word I've been pronouncing wrong my whole life that I don't know about
(discuss.tchncs.de)
A "Showerthought" is a simple term used to describe the thoughts that pop into your head while you're doing everyday things like taking a shower, driving, or just daydreaming. A showerthought should offer a unique perspective on an ordinary part of life.
Oxford English dictionary gives both pronunciations, your teacher is just a dick https://www.oed.com/dictionary/data_n?tab=factsheet#219838686 - it's like my ex who always gave me a hard time for saying "ant" instead of "ahnt."