I went to the doctor the other day. They weighed me in kg, then gave me a prescription in mg, and asked me to measure I/O in mL. It all made sense, and nobody seemed angry or baffled. Now, imagine they had weighed me in slugs, gave me a prescription in thousandths of an ounce (dry, not wet), and had me measure my urinary output in minims, and asked me to come back in two fortnights.

Everyone who uses metric finds it simple and easy. So, America seems confused.