If your having a group of friends over and you all agree that it should be a pot luck, then of course thats acceptable and not rude at all. In this case, it went like this:
"your invited to my housewarming, but would you mind bringing something like dessert or a sandwich platter". She's a friend of mine, maybe more of an acquaintance that I see a few times a year thru other friends...but we're not close. Not in the least.
As a guest, when im invited to a bbq or whatever, I will always come with a bottle of wine or whatever. If its close friends or family, i will ask what I can bring. Even if they insist that I bring nothing, i'll at least bring alcohol or dessert.
When im hosting, and when my guests asks what they can bring, I ALWAYS insist nothing. Just bring yourself. The only person ive ever asked to bring something (after she offered first) was my sister. I honestly like to pamper my guests and make them feel at home. I dont expect anyone to help me with dishes either. Your a guest, you sit and enjoy. Thats how i was raised.
Anyway, I just think its rude & tacky with a capital T as Eliza said.