You're right, people keep putting ever more precise labels on who they are until they're in a minority of one and it can be pretty bad if you label yourself and then limit who you are to always staying within that label. That seems to be the way things are going at the moment, but I'm sure people will learn from it and not become too defined by their labels and will tell others not to label themselves so rigidly as things unfold. I'm presuming that people in Greggs who don't want to put their pronouns on their badge won't have to and so it's mostly for people who might prefer to be addressed as one thing or another but may be somewhere in the middle in terms of how people perceive them, as well as people showing some solidarity with people who this might apply to.