When do you out a gay teenager?

http://www.bilerico.com/2008/09/outing_a_gay_teenager.php
9/4/2008

I'm in a quandary about limits.

I have a colleague whose teen son is acknowledged by his school friends to be gay. My kid says "everyone knows." But since my colleague has said nothing, I have no idea if he knows. I'm willing to show him I'm supportive, but is it appropriate for me to say something? Is it possible that the boy's father doesn't know what all the boy's friends know and seem to accept? Or if the father hasn't come to terms with his son's sexuality, should I mention "in passing" supportive comments about acceptance?