First, legitimate reasons exist for an app with such functions.
"He's one of the few people out here who's absolutely true to his art.
On the bus back from the cinema, a conversation drifted over from the back row.
A mother questioning, curious, her speech accented; her teenage daughter, with perfect RP, fielding her inquiries with the exasperated patience that flourishes between the ages of 13 and 21.
And just as feminists once fought for “Ms” alongside “Miss” and “Mrs”, people should be allowed to take gender out of their honorific altogether and go by “Mx”.
Getting used to “they” as a singular pronoun is harder but not impossible. However, there is more to the current Gender Revolution than upending our assumptions about the “correct” names or pronouns or hobbies or appearance for men and women.