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The thing about the customer always being right is, that becomes a big problem when the customer is an unhinged terminally online weirdo.

The actual saying is "The customer is always right in matters of taste."

It is misquoted on a criminally large scale.

The evidence seems to point to "in matters of taste" being a much later addition: https://www.snopes.com/articles/468815/customer-is-always-ri...