How would I communicate with the person of different culture?

Human spirit is the same but unique. Feelings are same for both genders, age etc.
Soul can communicate with soul without even making an eye contact. You can notice that within a mother and a child.

Regarding different cultures, your body is an instrument , you, the soul decides what to communicate with the other soul. Your soul is the master of your body, your physical senses. Soul has to take charge. Soul has to say what needs to be said and to stop when needs to stop. Some people love talking. Tongue does not know when to stop but soul( inner being) has to say to stop.

Driver of your body is your soul. Soul cannot fall asleep. If it does then you know what could happen. Awaken your soul. Apply this to food. Sometimes I like to eat desserts. My body does not know when to stop. But soul who drives my body should say NO if the soul is awake.

If soul is awake, the it will do the right things and say the right stuff and life will be content , happy.
Do not judge the person from his clothes but by his actions.