Being closed-minded is part of what makes this country great!
Most immigrants make an effort to speak the language, and I respect them for that. When I went to Paris a few years ago, I made the effort to speak French. I wasn't very good at it, but I tried, and I could tell that the locals respected my effort.
When I went to Tanzania a few months ago, I read up on some Swahili phrases and used them whenever I could. Likewise, the effort was appreciated.
So more Americans need to be more appreciative of the effort immigrants are putting in to learning our language. Because they ARE trying. So quit *****ing because they're not so good at it.