I have never heard such a stupid thing.
Fire the poor guy just because he isn`t a Mr.Smile? Is it better to have an Hypocrit smile beside you??
People don`t like people who doesn`t speak because they can`t form an opinion about them.I`d love to have some guys around me like that.
When I fly with guys who don`t like to chat ,I just ask a manual and study all the flight.
The time you spend studying in flight is the time you enjoy at home.
Good flights