I am 100% that human with no cultural norms or superstitions about bags on the floor, and I will absolutely drop my bags on any surface, including a floor (though if it's a questionable surface, it won't be my first choice, but I will mentally deal with it just fine). But I will also sit on any surface. I adore and have been to Japan many times, and the looks I get for sitting on the floor at places like the airport. I know it's awful - I never do it in a situation where it would be super out of place or impolite, though. I am almost always more comfortable sitting on the floor than in a chair because I can sit cross-legged on the floor no matter what. And if the airport is crowded, I strongly prefer to sit on the floor out of the way of busy areas because I'm one of the few who will do it and, therefore, free open spaces without humans instead of sitting between people. It's just a cube of leather and it's just a pile of cloth to cover my skin, it will survive and so will I! The airport floors anywhere are my butthome