Really? Hal doesn’t associate with any of the other Leaguers out of uniform to my knowledge. His closest allies are Ollie and Barry but again, he’s never hung out with them as “Hal Jordan” to my knowledge.
For some silly reason I keep on thinking that Hal has been to one of Wayne manors parties. Wearing his bomber jacket.
Going back to secret identities, someone really competent could piece together the identities of most of the Justice League. Even someone whose half as good as Tim Drake or Vic Sage.