His method was probably a bit obvious, but the psychology was superb. It is always easier to listen to unpleasant things after we have heard some praise of our good points.
I gave you good counsel. Save your spears and swords for the Seven Kingdoms, I told you. Leave Meereen to the Meereenese and go west, I said. You would not listen.
Cersei gave him a searching look. " Joff has had no lack of good counsel. He's always been strong-willed. Now that he's king, he believes he should do as he pleases, not as he's bid" .
" I'll range for you, bastard, " Rattleshirt declared. " I'll give you sage counsel or sing you pretty songs, as you prefer. I'll even fight for you. Just don't ask me to wear your cloak" .