Buffy hates Giles...post series

All I remember is a scene where Buffy calls Dawn and Giles answers the phone and she lays into him. When Dawn gets on the phone she says Giles is sobbing and asks if we hate him now. Buffy says yes.

Pretty sure its after her and Spike reunite in LA.

If the story suggested by Nikkilou isn't right, there's a scene like that between Dawn and Buffy in Distress Signals by PeaceHeather. It's pretty far into the story but sounds exactly like what you're talking about. Here's a link: http://spikeluver.com/SpuffyRealm/viewstory.php

oops, nope here's the actual link : http://spikeluver.com/SpuffyRealm/viewstory.php?sid=37107