My friends have a habit of inviting me to get-togethers at their house, at the last minute, and asking me to bring specific things, like shrimp rings, or once, a bottle of expensive liquor. They don't ask everyone, it's not like it's a pot-luck.
Am I wrong in thinking this is rude? They aren't poor. I think they just weren't raised properly. (For instance, no one got thank-you notes for their wedding presents.)
Is there a polite way to decline to bring anything the next time they ask?