You know the phrase "There's more than meets the eye"? Some people don't get that. She was obviously relying on what she had observed the process as, and had never inquired more deeply.
But yeah, thats a pretty stupid reply- I would expect that from an 8 or a 1 year old maybe!
Courage les garçons, et patience, vos femmes vont finir par apprécier la bière !