On platforms that support it (Reddit definitely did, and I suspect Lemmy will), you can enter the nonbreaking space with  . 0 mg.

I like that in Fahrenheit 0 is a cold winter’s day, and 100 is a hot summer’s day.

Fahrenheit fans always say stuff like this, but it just doesn’t work. 100 isn’t too bad in that respect, but 0 is just insane. If you want it to be equivalent, 0 °F would be 0 °C. Because there’s no way that -18 °C is as cold as 38 °C is hot.

Besides that, knowing about things like snow or ice outside, whether your fridge is likely to cause some stuff to frost over, etc., or whether the thing you’re cooking has reached boiling point are all just as valid things for your day-to-day experience.

But besides all that, SI is a package deal. You use Fahrenheit and now you’ve got to redefine all the other units that are derived from the Kelvin, because now you’re suddenly using Rankine.