I take an example of a German girl, Kathrin, interacting with a colleague, Zhang, from China.
Despite working in the same laboratory, Zhang and Kathrin hardly interacts. Kathrin enters her workplace daily and greets all her colleagues with a cheerful 'Good morning!". To her disappointment however, she gets only a mumble from Zhang, without eye contact.
After some time, she casts an opinion of Zhang being rude and unfriendly.
An experience in Germany has allowed me to learn that most Germans greet their fellow colleagues in the morning and eye contact between people during communication is important. In this case, perhaps Zhang is shy and dare not look at people in the eye when he speaks. This can be quite common for people who have little self confidence or are simply uncomfortable with eye contact. It could also be the case that this is how people interact in his hometown and he is used to it.
In this situation, as both parties do not require direct contact at work, the both of them left the situation the way it is. To Kathrin, she was only going to be working with him for 2 months and to him, she was just a temporary colleague. The relationship could possibly have been improved and the awkwardness reduced if both parties give and take and are open to each other about their opinions.
Hence, when dealing with intercultural communication, a basic knowledge of the other party is important and can be obtained from books or through speaking to people. Coming from ourselves, we should also speak up and inform other people when we find that they are behaving in a way that we and our culture is not comfortable with.