Why are British talk show hosts, like Alexa Chung & Craig Ferguson, rude & demeaning to American celebrities?

Is it because the producers are Jews and hate Christianity and America and since "American Idol" got high ratings because of Simon Cowell's rude and cynical remarks to his contestants, it was too irresistible for the Jews to demean American culture, its values and its artist while at the same time getting good ratings as a perfect cover?