Nah, I don't think it's rude. I don't have to store our bins in the garage, so that might change my mind, but I don't really stick around my bin long enough when throwing bags in to catch any potential whiffs of poo. Our bins are kept in our very small front area which is basically right next to a public path. People have often used the bin to dump some rubbish in as they're passing, including a bag of dog eggs. I just can't bring myself to care, it's a rubbish bin. Now that I've thought about it, I don't think I've ever noticed a smell coming from my bins, and I've put SO many bags of used cat litter in there. Either I'm really lucky, or our big plastic bins are really excellent at keeping odours contained.