I don't mean to shame the author, but I really do think this is quite sad, and the fact that this isn't even surprising is one of the things that I dislike about being a native English speaker. It's just too easy to get away with not learning the language somewhere. Not learning the language is not only isolating, but IMO rather weird / presumptuous if you're living there long term. Having lived in Germany for around a year and a half now, I am often a little embarrassed about speaking English in public (but that's also partially the Canadian in me not wanting people to think I'm an American), and I find learning the German language to be a quite enriching experience.
There's a lot of culture embedded in language, and it's really worth learning new languages, especially so that you can better understand and relate to the people around you in the country you live in. People often have different personalities in different languages too. You may find a new side of yourself when you learn German, and you may find a new aspect in some of your German friends.