First things first: I'm german (so my english wont be perfect) and while we're learning english in school I learned most of it through videogames and movies in the end - specially here because I felt the need to be able to communicate.
That leads to the problem I've got with "only german"-people: they dont make an effort. I've meet people in their twenties telling me they dont speak english - like wtf?! You've been playing this game for half a year now and didnt saw it as a great chance to finally learn that language then? By just playing a game and doing something you enjoy? Nope. Nope. Nope. Not tolerating this. (that being said: I'll still speak german to explain strats or stuff like that if they dont understand english - for the sake of a smooth run. Since I consider that highly impolite I will always apologize and give a short summary of what I've just said - specially if its including the names of the other party memembers)

I'm (jokefully) always using my "hate" towards those ignorant german-guys as excuse for hating only-french people - specially because I had to make the experience (and have been told by french friends) that they do indeed speak english - they only refuse to. I remember several runs with frenchies who didnt made an effort communicating with us - until we wiped twice, THEN they magically were able to speak english. I recall that one run in SV I had with two french-guys and a friend who does speak a little french and therefor was translating for me - I was tanking and only doing small pulls because the french healer wasnt geared that well and new too. So, what they did was making fun of that and how bored they were. In french. In party-chat. Since I got a translation I started running off like a madman pulling everything I could - we wiped, I did it again. And the miracle happend: They started speaking english! :O Letting me know they couldnt heal that much!
I'm always thinking of that dungeon run when I come across french people who fail to communicate - its either that they've refused to learn english when its a language the world more or less agreed on sharing or they refuse to speak it and to listen to it - with the later being the worse. Both have to do with ignorance though and thats something I dislike and dont tolerate.