Is it normal for people not to adapt to the local culture while abroad?
I am really trying not to be racist (I am from a minority too actually), I just want to make an observation about what I have been noticing a lot lately.
I live in a quite international European city, but I originally come from America. We have people from all around the world here. I have been at the university for some years, living with people from many different cultures. And I have also been working at a hostel for a while, also getting to know people from all over the world.
What I notice is that people from eastern Asia (Japan, China, India, Korea, etc) and people from Muslim countries never seem to be the least interested in learning about the local culture. They just don't want to adapt at all.
I see that they only hang out with each other and don't really try to befriend other people. Also, whenever they are forced to interact with anyone else, they act just like in their homeland, they don't even try to learn some basic courtesy.
As examples: I had this Muslim guy living with me and other 3 people in the same flat, who basically acted as if he ran the place and forced us to live like Muslims. I also had this Indian friend who has been living here for years, and he doesn't even know a single phrase in the local language. He doesn't even know English well and he told me several times that people are supposed to make the effort to understand him.
So, I just wanted to know if this is normal, or I am just rather unlucky with international people.