I have no stake in this one way or the other, but I just want to say that your position 'winning' the debate may or may not mean anything to anyone other than yourself. In other words, he should bother if he cares about 'winning' the debate, but if 'winning' the debate means nothing to him he is entirely free to abandon the debate if he so chooses and carry on with life, secure in the belief that his position was correct.
I think that everyone has their own point at which they no longer see any value in pursuing a debate over a given topic, and will be willing to let it go. Let's face it, this is a debate over a small matter of instrument setup between anonymous parties on an internet forum. Whatever loss of 'face' that occurs in this situation may or may not be a big deal to any given person. Let's not forget that this thread was started by someone who was simply asking for help.