Dear Anxious Catter, however much time you have spent with him and his family, whatever he may have said to you, that boy is not your friend.

The sex thing is merely the outward and visible sign of the respect thing, which is the core of the problem. Wash your hands of this fellow; in fact, you should have done so when he made his so-called joke. If his friends and members of his family ask why you don't come 'round any more, tell them.