While I'd agree they are poking fun, I wouldn't call this "a campaign designed to exploit anti-American sentiment in countries like Germany". They are exploiting a stereotype, something that has been done over and over in advertising campaign. Every nationality has been targeted at one time or another. I've seen stand up comedy routine that poked fun of French Canadians and laughed as hard as anyone. People need to either get a thicker skin or develop a sense of humour.