A while ago I made a thread about Tokyo, and their skills in English.
Most were very helpful, but some people were honestly offended by the idea about asking such a thing.
Not directly quoted, the the meaning was more or les "How dare you assume people know English?!? Learn the language instead, shitlord!", "ENGLISH ISN'T EVEN THE BIGGEST LANGUAGE!", "Your English isn't perfect so don't be a hypocrite!" (No shit, I'm not from a country where English is the native language...) etc., which I can't understand at all.
Of course I learn some basic phrases in their own native tongue, but it would be silly to expect to learn every single language of every single country people visit, especially for people who travel much, like me.
Why is the idea of a language everyone can communicate with so triggering for some people? To me, it's one of the best things ever as it allows me to talk to people from all around the globe, without having to stand and stare at them like an idiot because I have no idea what they're saying.
So, all in all, why is it so offensive, to some, in simply asking "How well can you get by with English?"? Why are some people against a global lingua franca that binds us together?