if you're going to nitpick then make sure you're not technically incorrect.
You're talking about the SI system, which is a metric system but not the metric system.

Quoth wikipedia (yes wikipedia isn't a source, but i'm not the one who started nitpicking so i don't have to be nitpick proof :^)
"... metric system refers to ones that standardise a set of base units and a nomenclature describing relatively large and small quantities using decimal-based multiplicative unit prefixes (such as kilo and milli). The International System of Units (SI) is a good example, and there are other widely accepted systems (less popular than SI) mainly used in specific fields, such as the Gaussian units for electromagnetism."