The singular they is proper English in my book. I would do it if I was chess.com because using "He" would cause a world of trouble from the politically correct and"he/she" is completely cumbersome and awful.
You aren't "picky" just pompous and not especially well educated.
Just wondering.... Am I the only one who is annoyed over and over and over by the failure of the system to used the language properly?
I'm not talking about non-native speakers who make minor errors, but about the messages from chess.com itself. To wit, "Johnny has disconnected. They have 5 minutes to reconnected. They have 5 minutes to reconnect."
Can't chess. com decide whether Johnny is one person or several persons?
Huh? Pretty picky aren't I?