I'm not in the U.S. Anymore

When I arrived in China I was quickly reminded at the Shanghai airport that I wasn't in the U.S. anymore (besides the large amount of Chinese people). While I sat in a restaurant in a small booth enjoying my vegetable noodle bowl, a strange Chinese man without acknowledging that he was invading my table, sat down across from me at my small little table and ordered. I wasn't quite sure what to do as he was loudly slurping his noodles about 2 feet across from me. Do I give the guy who, in my opinion, rudely invaded my space or do I avoid eye contact? I thought welcome home!