No way! I can't believe it when I see bags on bathroom floors. It's so gross, it makes me nauseous. In restaurants, I put it in a chair next to me and cover it with a pretty scarf or even a clean napkin. Or if my back is to a wall and there's no foot traffic going on behind me, I'll hang it on a chair. Otherwise, if it fits, I'll keep it on my lap.
I just can't put my bags onto the floor no more than I could let my kids crawl around on floors in public places when they were little. I did pick up some of those purse hooks at Linens and Things and it's kinda flimsy and cheap feeling. I think it will work out okay but I need to find a sturdier one or atleast one with a longer arm. I'm a self confessed germophobe and proud of it!