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We should stop saying "The customer is always right" because it's not true
(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. The best ones are thoughts that many people can relate to and they find something funny or interesting in regular stuff.
Maybe because that's not the full quote and you're misunderstanding the meaning. This is like when people think "survival of the fittest" means the strongest/fastest etc.
It is the full quote and OP is not misunderstanding its meaning.
https://en.wikipedia.org/wiki/The_customer_is_always_right
You’re thinking of a later retort that was added to try to change the quote.