Think if you just started a game and wanted to train with a buddy, possibly knew in real life, you wouldnt want advanced members to come and wreck it for you.
This happens to me alot if they are polite like he was i spec and see if they are farming,if they aren't farming i leave
Its funny how everyone assumes they are farming with no proof evidence, and the only thing to go on 2 buddys trying to play on people in a good range of skill from them, and asking nicely for someone to advanced to leave.