RICHARD: I guess you can’t take constructive criticism.
LORELAI: Nothing that came out of your mouth today might, in any universe visited by Kirk or Spock, be construed as constructive.
A reference to the original series of Star Trek, previously and frequently mentioned. In the episode “Mirror, Mirror”, Captain Kirk and other members of his crew visited a parallel universe they called the Mirror Universe, where they meet alternate versions of themselves. It is regarded as one of the best episodes of the original series, and the Mirror Universe was explored further in subsequent Star Trek shows.
The Annotated Gilmore Girls 