John is absolutely right, as he so often is. The more respected and respectful members here don t, although you may see an occasional, what the hell or some other small exclamation. But for the most part no, it isnt allowed.
The only thing I would change about your post John, is instead of imagining walking into a party, imagine walking into a dojo. Or even worse, your Grandma's house.
In any event, you'll find that most of those people dont last long anyways. Once they break one rule they think they can break em all. Then its bye bye.