I was born in the US and have switched by myself. My brother thought I was weird until one day we went to the hardware store.
I needed to buy a 15/64 in drill bit, but they didn’t have it. So then we thought, fine, maybe we can use the next closest size…
…
Except WTF is the next size up or down from 15/64??!!! Neither of us could figure it out. Internet wasn’t great. Sales people didn’t know. We left because we weren’t sure what to buy.
In metric, it’s trivial. 5mm drill bit, 4mm is smaller, 6mm is bigger.
After this, he stopped thinking I was a weirdo for using metric measurements. But he still uses imperial because murica.
Also, interesting, I learned that he thinks imperial units were invented by the US. I told him they were British units and I stopped caring about British units in 1776, but he didn’t seem to believe me.