What do you bring? - A "typical" dent post.

[Arthur Dent]

Not saying i don't tell the truth. Most of the time, your doing the person a favor when you tell 'em their breath stinks or that sweater makes 'em look gay or something. Just got to do it in a polite way so they don't feel insulted.

As for a rude guest who doesn't bring anything, I'd rather be subtle and thank each person for what they brought in front of that person and see if that makes them feel guilty. If not, then maybe say something in private before they leave if it's a good friend. if it's a total Asshole, just don't invite them again if possible.