I was raised to be pretty "prim" at the table, but I do enjoy sitting with a leg tucked under my bum (at home only)
Once, in a restaurant on holiday in Croatia, I had put both my feet under my bottom (I was very relaxed and not in the middle of a restaurant, but with my back against a wall), I hadn't even given it a thought, but I had tucked my legs under my bottom, leaving my flip flops under the table (it was a beach resort). I was spotted by some German kids, who were shocked and pointing to their parents who glanced over...then I realized that the parents were smoking at the dinner table with their young kids and I suddenly felt a lot better than them! HA!
In terms of other people's bad table manners:
My niece stabs a sausage and shoves it in her mouth, bites off a piece, and when it's too hot, she spits it back onto her plate with saliva trailing it...she's 10!
My husband's family also allows the kids to dig the white part of the baguette out, leaving the crusts for others to eat, and when there is icecream or cakes, they allow them to touch it and lick their fingers before serving other people. Oh, and they also stab with their own fork out of the communal salad bowl.
They also have symphonic sounds of loud, open -mouthed chewing from the kids.
Needless to say; I've tried to avoid meals with those kids.

