Loud slurping  may be rude in the U.S., but in Japan it is considered rude not to slurp. Oh, and don't forget to use your chopsticks to get the noodles into your mouth. It is also acceptable to bring your small bowl of food close to your face to eat, instead of bending your head down to get closer to your plate.
So next time you plan a trip to Japan,do not forget to try this out,and common there is nothing rude in eating the way you want.
Take a try.