That could really be anyone, anytime. You are rally overdoing it sometimes Imp
Here is lucky guess : Sansa?
Based on ironic sarcasm quotient I am going to guess Tyrion.
While we are at AFFC, it's the blackcloak singer (Darion, Dareon,...) about Sam's royal behind.
Maester Aemon? It sure doesn't sound like something he would think, but I'm certain it was during their trip to Bravos, and there is no one else, or is there?