On the contrary, this isn't really as strange as one might think. In my experience, Mexico and Latin America in general are much more accepting of all things German and European than the USA is. Soccer for example. Huge hit there, not so much here. Part of the reason my wife, who is from Mexico City originally, was interested in me was my German features. And not all people in Mexico are poor or drug dealers. That's just what the press would like you to believe.
It's an interesting photo none the less.