@Kanaloa
Although for those who are he/she/they, presumably you have to ask every time you see them what pronouns they are using today, so really just an attention grabbing stunt.
I'm not even sure you are allowed to ask, you have to either check to make sure they don't have the information over multiple badges or, and this is by far the preferred option, you should just sense it and therefore know exactly how they are going at that exact moment.
*I have used they because, oh feck it, it is just what English language norms dictate.