They're unrealistic or immature.
Growing up bilingual, I understand the attachment to a native tongue but, if you want to be able to function well in society you have to learn the language of the country you live in.
That being said, I have relatives who've lived here for decades and still don't speak English. They go to the Greek grocery story, and the Greek doctor, and the Greek dentist, the Greek Orthodox Christian Church, etc., and they have a small army of Greek friends. It's not easy to find the opportunity to learn another language when you're busy working and raising a family. What they DON'T do is complain about English. They feel lucky to live here.