Let's imagine that somebody went to a bar (asking for three barrels of wine*), seeing everyone in the bar drinking, but the owner told him there's no wine left. And now, someone (drinking in the bar) says: we've drunk all the wine here, oh, there's one bottle left, do you like to have it?
*This is the content of previous pages.
Well, the words used are not in the normal polite form, but I cannot say that's too rude. He just used the way to speak to some friend.
The one who came to ask for wine is someone considering himself "boss" of the area, and anything not working in his way is an insult to him. (He is one of the "bad" characters who are deliberately written as such.)
Finally, you must really be very careful in using mangas to understand Japanese culture. Most of the mangas are not about the everyday life in Japan, and a lot of them are in some imaginary world. Usually, what the characters (either "good" or "bad" characters) do would not reflect how a normal Japanese person would act in such situation.