I don't even necessarily disagree that it's counterproductive, I just don't think it's fair to attack someone for using esoteric or unconventional language. Yes, it inconveniences the listener - or in this case the reader - but in this context no one is being forced to engage with OP. By using some Old English letters OP is just having some innocent fun at no one's expense, which doesn't warrant the harsh response they're receiving.

If you were talking to someone and they casually used xe/xey pronouns (or any neopronouns for that matter) to refer to a friend who isn't there, would you go out of your way to lecture them about what an inconvenience it is to you to have to learn something new?