1.Very rare. We use knife and folk when we go to restaurant and eat steak,hamburg or something.
Most people use knife and folk to cut steak.THEN, eating it with chopsticks haha.
2. we have many TV shows which featuring foreigners in Japan or Japanese in foreign countries these days.
Especially last several years. I think that more and more Japanese are interested in foreigners. in a good way I think.
3.they are welcomed! cuz most of us cant speak English haha.