loving... arguments.
Let me answer this riddle for the both of you. Even if American Scientists use the metric system, this website wasn't made by the people actually doing any sort of high-end science. THAT MEANS that the website was made by someone who still considers "Standard" to be Feet and Inches, or "non-metric" measurements.
This website is signed by the US Department of Health and Wellness, but they aren't Chemists or Physicists. They don't really hold themselves to true scientific standards and they, themselves, use feet and inches. The scales in our clinics and health offices are measuring height in feet and inches still, so that shows you how much our "Health and Wellness" centers care about the metric system.
Just clearing up the root of the argument.