In My Opinion, this pilots' comment is representative of a particular political point of view, that I'll stay away from for the purpose of this post. The fact that he is departing a city that speaks every single language in the world, and has people living in it from every single nation in the world is completely lost on him..
In short, he's a dumb.. Sure, he can operate an aircraft, and he can run the numbers and all, but at the end of the day, his point of view that America is an English only country, points to a strong possibility that he is just plain stupid... The world revolves around HIM and he's not smart enough to observe what actually goes on around him..
I would have made an excuse to slow him down big time but Boston John is a better man than I..