My son is 15 and lives with his mother in a strict JW reigime. He told me the other day that he made arrangements to meet his friend from school to go skateboarding. His mother found out and made him call his friend from school and cancel.
She then gave him a long lecture, complete with a Young People Ask Video about association. (Did not know they had Videos of the YPA !!!!! The books were bad enough when I was 15)
It seems the main points appear to be:-
1/ Bad association spoils useful habits.
2/ He may get led astray.
3/ Other witness children may see him and be stumbled.
Not sure how to advise him, I went through exactly the same thing at his age. I do not want to see him lead a double life or be socially disabled in any way.
On the other hand I do need to be careful not to counter indoctrinate as this may be counter productive, I leave hints but nothing definate.
Any suggestions.....