I use Fahrenheit just because it's a pain to get everything set to Celsius and other Americans don't understand it. But I use grams, kilos, millilitres, kilometres, etc. Yes. And if someone asks me to guess the length of an object I will give centimetres, and refuse to translate to inches and their stupid fractions.
I kind of get it, it's like language immersion. How do you easily describe anything besides the freezing point and boiling point of water in an objective way? The rest, you can point to and say "this weighs a kilo" ot "this holds a liter." And if you don't force people to use it, they'll simply refuse. And we all carry handy unit conversion tools with us wherever we go these days, so if they don't want to learn, they can easily translate it themselves.
So you use Fahrenheit because Americans don't understand Celsius but you don't convert to imperial for them if they don't understand? That just seems inconsiderate as it's really no trouble at all