Just wanted to add that I understand all the tongue-biting, etc. I do it, too. In fact, as I mentioned in another thread, a few years ago, my relationship with my ODD was rather difficult, with periodic episodes of our not speaking. Finally, I decided to pick my battles more, not always react to perceived slights, etc. Sometimes it bothers me, too, just as it does some of you. But it has improved our relations a lot. And when I think that my long range goal here is to maintain a relationship with both my DDs and my GC for the rest of my life, if possible, well, it seems very worth it.
Jingle, I'm glad things are ok with your son now. I must admit I don't totally get what happened. Or rather where it happened. Was it in your house or his? If it was in his house and they were his biscuits, that's one thing. But I doubt that. If it was in your house or the biscuits were yours, how could he possibly think it was ok to tell you what to do with them? I think it would have been totally ok for you to tell him something like, "Excuse me? I reserve the right to do as I choose with my own things/in my own house!" But regardless, I'm glad he learned his lesson!