No joke, all his comments so far have been along these lines.
He can't logically back up the claims he makes, so he just rambles some irrelevant idiom and pretends to take the high road. There is no point in trying to add logic to argument at this point. On top of that, he seems to be very stuck in his ways.
Regardless, I'm glad there are those willing to share experience of being in my shoes. Its encouraging, to say the least.
YOU have 'backed up' my position
your back-handed insults will not help you
pick up a text on xfmrs/machines and dig the ditch yourself