No, you openly trying to impress your male friends by dancing with me does not impress me. For the four songs that we danced together the only topic you found was my level of German - the deepness and uniqueness of this conversation does not impress me either. Saying that you can be beneficial for me because I can speak German with you I find offensive - I really appreciate other things in people than what they can be useful for. And telling me that I am awesome, great and wonderful after 10 seconds of knowing me only makes me imagine how the fall from that pedestal would feel like. So: sorry, but no.
Maybe I don't know German pickup lines. Or maybe I don't know pickup lines at all. Maybe that is why I am single. But how can continue dancing with a guy who made me feel uncomfortable, offended and like an impostor in 5 minutes? Is it really my issues? Or his dumbness?