Was “Sir” a translation?

“Master” vs “mister” is annoying because technically there are a lot of rules about the use of one or the other, but these rules differ considerably between countries. Apparently in parts of the US it would be rude to refer to anyone over 12 as “master”, but in other situations I’ve been told it’s perfectly acceptable until early adulthood, or until one becomes a father or marries. I generally hope forms only give me “Mr.” as an option.