If you think looking at expats to find stupid people, you're looking in the wrong place, as they are able to either live there, vacation there, or retire there... so they must be somewhat successful and would probably be above 'average'...
Now, look around at the people (not all, of course) stuck in their motherlands, wanting desperately to get out of their hopeless situation and blaming everyone but themselves, with no means, or capability to leave... and worse.
They are the average, and the ones of whom George Carlin speaks