I lived in India for a while and ate with my hands all the time - a scoop of rice with various sauces on a banana leaf. I miss it. When you're in a new culture, adapt to the local customs. Seriously, this stuff is not that hard to figure out.
"When you have finished eating place the fork and the knife in the 4:20 position (shown below) or across the middle of the plate, parallel to the edge of the table with the handles to the right and ending on the edge, not hanging over. Either way is correct. The fork will be nearest you with the tines turned up. The sharp side of the knife points toward you as well. Why, you ask, is this important? Because this simple universal act signals to the staff, waiter or otherwise, that you have finished your meal."
Do I care if someone uses the wrong fork or water glass? No. But there are people that I no longer eat with due to their table manners--talking with a mouth full of food, plate lickers, that kind of thing. To be honest, I'm over fine dining and when I travel I focus on street food or small local places rather that the hot restaurant of the moment or city. Drives my wife crazy.
I'm cool w/ using your hands at an Indian or Arab place. Takes some dexterity to tear the naan using only one hand, doesn't it? Thing about India is that all the common restaurants have sinks right in the dining area where everyone washes up before eating. How many people in the west wash their hands before eating? I reckon not that many.
And I hope everyone minds their Ps and Qs with napkins, e.g., knows where to put the napkin when you leave the table briefly during the meal and where to put it when you're finished and have left the table.
Where do you put them?