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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. A showerthought should offer a unique perspective on an ordinary part of life.
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.