Many do this. HS does not run the mile, but we say "mile" when referring to what we know is the 1600.
Why? We're not lazy. We run. We're not imprecise. A 4:09 and a 4:10 1600 are not the same.
We're not stupid.
Why can't we say "sixteen hundred" or just "sixteen" when we know that's what we mean?
Don't do it again.