* meters
* kg
* lean celsius but don't care too much either way
* abolish seasonal time changes
* for online calls/events specify time in UTC
* YYYY-MM-DD date format
* ground floor is 0th; don't skip 4 and 13
* don't put sugar in cold tea

Simple rules for a civilized society.

Anyone who uses MM-DD-YYYY should be arrested fr fr

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It probably sticks because it matches natural-language usage: "I was born on January 31, 1994"

East Asian languages are better at this: in Chinese you would say 我是1994年1月31日出生的

(So the "MM-DD-YY is a better fit for humans" thing is false, East Asia works fine with YYYY-MM-DD even in natural language)

French people formally or informally use the 24hr way of telling the time, it's definitely not strange and actually more fluid to say "20h" than "8h du soir". 
in Chinese if you say 20 o'clock will be strange for anyone:  晚上8点，如果说(晚上)20点大家会觉得奇怪。