Well I'm obviously not bu because it's true that In the UK dogs, rabbits, cats etc are weighed in kilos ( ie you tell me your dog is 25kg and I can imagine the size )but babies are 8lbs 2oz and if you tell me the equivalent in kg I have no idea.
On the flip side I can imagine a 5k run more than a 3.3mile run but longer distances are in miles. Wine is in CL but pints are most definitely pints (as is milk but not coke)
Aibu to think we should decide what system we are using??