What an extreme reaction. Many people would not be able to parse it since they've never seen a number written in this way, but you immediately write them off as assholes. Wow.

For people who grew up in countries where comma is the decimal separator (and dot the thousands grouping separator), this is highly unintuitive, because it would seem much more likely to be a misplaced punctuation mark.

It might be moderately intuitive to English native speakers because of oral usage like “point one three eight”, but that’s also not a thing in many other languages.

Stripping zero is not a common practice. You are clearly speaking of your own bubble here.

For most of the world that is even more ridiculous than using dot as decimal space separator or writing dates with month not in the middle place.

Even Americans I work with don't write it like that when doing quick draft discussion, as they know it's confusing to others.