I don't talk like a man, and I don't talk like a woman. People are only used to hearing men and women talk. That's the scope of their experience talking to human beings. Which means that I don't sound human. I sound like some kind of bizarre alien intelligence. It's scary for these people.
You're making an assertion that people can identify specific personal details over text, but somehow we still need to use a /S to identify sarcasm because text doesn't convey tone or body language. That requires some pretty heavy backup.