If your son called all upset about something and said a few bad flavored words in the process you fellows would be more concerned about the language than about whatever was causing the stress?

The language can be dealt with at a later time. The boy is 16. Which ones of you didn't drop the F bomb a few times by then?

I slipped up and said a couple of other bombs in front of my dad when I was about 12. Dad didn't jump me about it but an odd look got the message across.

I would imagine he's a fairly independent boy to start with for his age. You don't have to condone it but at 16 your probably not going to stop it either.