Chewbacca
Why do I need to know someone's pronoun? What interest or use is it to me when all I want is to ask if something is in stock/how much something is/whether I need a carrier bag or not? Why is someone's private affairs being announced on a badge on their shoulder to customers who dont need that information to make a purchase?
This is the only reason: M&S (to score more Stonewall points) as they have already made the changing rooms in their stores to “unisex”, which means there are no longer safe places for ^women and girls.^
But how does their pronouns being on their badge impact you in a negative manner?
I can see, and mentioned in a previous comment, the potential risk for harm for those wearing the badges.
I don't see the negative impact for customers.
That said, I'm not a fan of all bathrooms being unisex. Male, Female and Unisex would be my preference. Of course, if people didn't insist on policing other people's gender identity, Male and Female would suffice, but an additional unisex bathroom could also potentially shorten the lines at the ladies bathroom.