I went to school with kids from HK who arrived and didn't speak English very well. After a short time their English improved substantially, and after a couple of years, frankly, many of them could write essays with better grammar than many of the caucasian native English speakers in the class.

Instead of criticizing immigrants for being different, how about we welcome them, support them, and make a better home for everyone.

Part of the reason it appears that they don't want to "integrate" is because so many people around them are instantly hostile.

Be welcoming and you will be surprised at what you will learn about the world (and about yourself).