Manners vary all around the world.
Slurping soup/noodle dishes is considered normal/expected in most of Asia (notably China, Korea and Japan). Burping is something men can do with impunity – it’s seen as a compliment to the cook.
Public urination is still pretty commonly accepted in rural parts of China and Japan as well. (Though in big cities this is frowned upon as of the last decade or so.)
This (public urination) always struck me as incredibly different from my western upbringing though I witnessed it (and spitting, also considered fine – as long as it was directed at a Benjo—the open sewer grates on the sides of the road) over and over.
Conversely, it is considered terribly rude to blow one’s nose (into a hanky or tissue) in public in Japan. You need to do that in the privacy of a bathroom stall. So, blowing your nose into a tissue = rude, peeing on the side of the road = OK.
For women, even the SOUND of urination is to be masked (there is a button on the toilet that makes an electronic flushing sound) in public restroom stalls. Oh, and there’s an app for that, too.
So..clearly there is a different standard for women than men in Japan… Farting and burping are not something polite women in Japan ever do. And, when and if we should pass gas it would be scented like cherry blossoms.
Oh, and the table manners that I was taught as a young girl (when not eating, hands should be folded in my lap, never leaning on the table) were considered rude most of Western Europe and China – where I’ve been reminded by business colleagues repeatedly that when not holding utensils, your hands should be visible above the table. (France, Italy most of all, but Germany and China, too.)