People live in different parts of this planet, customs and culture were local in the past, some customs came with travelers, and some grew locally. What is decency ? What is normal ? How do you behave towards other people in your own community ? Do you behave different to other people from outside ? If you move to another country, do you try to live amongst people from your own roots ? Do you try to integrate in the new culture ?
Talk about different dishes, the food all over planet earth, what people eat, what people don’t eat… What’s cultural, what’s religious ? Where are the borders between religions, cultures and ethnicities ? You can adapt to a culture, you can convert to (another) (a) religion, can you become part of an ethnicity ? What will make you accepted in another culture ? Fully integrated ? Do you loose yourself and your native culture if you go there ? Do the others really accept you ?