[alpaca128]

> your work signature should be kept professional and that means excluding private data.

Unless you live in complete isolation your gender is not private. As soon as someone sees your appearance or hears your voice they will subconsciously associate you with a gender. And if that association is often incorrect then what's wrong with avoiding awkward situations?

We don't mention ethnicity or religion because they're not relevant for communication with business partners. Genders are, due to how our language works.

I wouldn't enforce mentioning pronouns as in the majority of cases it's simply unnecessary, but if someone has a problem with that detail in an email signature that tells a lot more about them, enough for me to reconsider working with them. Because no, it's not an important thing for me, but if someone thinks themselves as too professional for such little things they're probably not a pleasant person.