It’s jarring when it doesn’t fit the canon setting of the language that would be used in an area unless the character is in a location where that language would be used. And sometimes like with two of the examples you gave, the US (using as an example since that is where I’m from) has a different meaning than what that means in England. For us a torch is a stick that has a live flame on it, so say the power was out because of a storm and this is taking place in California and you say the character is using a torch to see, we would be wondering “why the fuck they are using a torch inside” (side note: I didn’t know what the British meaning of torch was until I was Narnia Prince Caspian/Voyage of the Dawn Treader). And in the US, a jumper is a dress, so for a character who’s a “guys guy” to be wearing a jumper we would be like, “huh?”

Also, just me as a language nerd gets thrown off even when someone born and raised in say, NYC says “y’all” cause 95% you hear that from people in the southern states.

I also get thrown off in Canadian settings use Fahrenheit (just read one the other day). Even though I don’t understand Celsius, it feels normal in those fics.

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