Katy Perry was trying to impress Neil deGrasse Tyson, whom is an absolute genius, by stating that she has a crushes on Socrates and Plato. Tyson pointed out that she had a line on her Twitter bio that derived from a famous quote. Needless to say, she was dumbfounded. (I would have been too though.)
HERE is an article that I didn’t write that features the video too.