I mostly avoid being rude to people. Personally, I only threat someone bad when the person is obviously annoying me on purpose. Some marketeers just want to squeeze profit from other people, buying for half of item's price and selling it for nearly market's on forums. And then, when they receive an offer they dislike, they just go rude and start harassing others. Meh, those are rude just because they want that quick profit on their hands.