If you see a man on the Internet and think “this man must be married and his wife must not be interested in this because wives (women) are not interested in these things”... that’s pretty unhealthy. And making a joke about it, and it becoming a social norm is even more unhealthy.
SV/the tech world at large clearly has issues with stereotypes and being inclusive. Why not avoid doing that and just say “friend” rather than making a lame stereotyped “my wife” type joke...