Just start being that pedantic asshole that people hate, and insist on using it. When someone asks what the temperature is, give it to em in c and make them do the conversion.
I set all my stuff to metric years ago and use it pretty much exclusively. I don't actually make other people convert, I do it for em. But still.
I use metric temperature when I talk to my kids. Now they give me a hard time when I give them a Fahrenheit value! Keeps me honest I guess. I've also got my oldest using a 24 hour clock.
Temperature was the first thing that really clicked for me, and the only one I never have to think about to translate, I just "know" what the temperature is both. I learned it by thinking of it as percentages. 0 is freezing, 0% of boiling. 100 is boiling, 100% of boiling. Lol. 30-40% of boiling is hot, and pretty good for a bath. Haha
I never understood why people get their panties in a twist when I use 24h times. I get that it's confusing if I drop the colon and just write 1854, but 18:54 isn't that hard to figure out, is it?
Edit: Corrected 25h to 24h, thanks to MindTraveller for mocking pointing out my error
Yeah, it's sort of rare outside of, like, foodies and and YouTubers to use weight for cooking. We switched to it about a decade back, and it's been amazing. That's actually what got me to switch to metric for just about everything.
From what I can tell Americans used to use scales for dry measures (in ounces) but somewhere along the line, they switched to volume measures for everything.
As a Canadian, it’s really frustrating because often will get the American versions of UK cookbooks here which are both not metric and not weights.
I enjoy my Australian cookbooks with metric weights.
Leave off the word "metre" and it doesn't matter whether you're using metres or cm. You're "one eighty-six". Is that a lazy way of saying "one [hundred and] eighty-six", quite common when talking about numbers in the hundreds, or the lazy way of saying "one [metre] eighty-six [centimetres]", a common shorthand similar to shortening "six [feet] five [inches]"? The answer is it doesn't matter!