I love my bags, but they are just bags! [...] I personally would think it was more rude to place my bag on somebodys coffee table than for them to put my bag to the floor!
I agree with this.
To me, the question at a party would be, "How in-demand are the seats?"
If there are a lot of people and not a generous supply of seating areas (or not a generous supply in the vicinity where many people are congregating), then quite frankly, most people would believe that a living, breathing, human deserves the seat sooner than a bag and/or a coat. Especially if they see the bag/coat's owner just standing around chatting with someone else, or even sitting somewhere else (that is, if it's clear that the owner isn't coming right back to sit in that seat themselves). ...... Honestly, at that point, I think most people out there would argue that a human's bottom (
) would take priority over any bag's bottom.
Another case that was mentioned, where the owner got up, went to the buffet, and came right back ... that's a little different, especially if other guests could easily see that the seat was vacated *only* to get more food and the owner would be immediately returning.
But if you're not going to use the seat to sit in yourself? Than yes, quite frankly, most people would argue they have more right to that seat than your inanimate objects, no matter what brand those objects happen to be. I think we all know that most people out there aren't as keenly focused on their handbags, as the general membership of tpf are.
If you trust the other guests to not steal anything from your handbag, then try to find somewhere out-of-the-way to put your belongings. Ask the hostess if you could put them in a bedroom or something. Somewhere that guests wouldn't want to (or have a normal right to) sit. And if you don't trust the guests enough to leave the bag in another room, then you probably shouldn't be leaving it alone on a seat anyway.