Friendship intimacy calls for whoever is on the receiving end of the information to offer "hefty helpings of emotional expressiveness and unconditional support." Yet, as Karbo points out, they can't be too opinionated. So if I'm enraged that Matt canceled our Friday night plans, again, she better huff and puff and agree it was lame of him, but she would never say "He's such an ass, I've never liked him." Such are the unwritten rules of friendship.
