You realize that people, in general, are dumb right?
All because Europeans call us dumb doesn't mean that the fact that 90% of people are morons reaffirms a general stereotype of the human race.
general stereotype of the human race you say
well
the problem is everyone is a moron one way or another
everyone can be viewed as one in some sort of perspective
also, who the forget generalises themselves
it's not like the europeans are the only ones joking around