On a general note: if the artist really meant it when he said his art is supposed to break down these stereotypes, methinks what he really achieved was just re-freshing and reinforcing some of the crudest stereotypes.
He also said in reaction to the outrage that ountries should be able to laugh about themselves. Which insinuates that his stereotypes actually describe those countries...
BTW, what is the Czech one supposed to symbolize? I somehow failed to gain that insight even from the text. *Lunatic*, n. One whose delusions are out of fashion.