This is fair enough: selective arguing goes both ways. Glossing over that, selectively, I've been picking up a little more of 2) in the Prof's posts recently. I can't blame him, since he takes a lot of heat here. But I can not engage with him any more. Either one of those is good reason not to waste your time with someone.
Agreed. I selectively respond to his posts if I find them interesting, but I gave up thinking of any exchange with him as a 'discussion' a while ago.
@TakeTheSkyRoad: very nice analogy (the 'garage full of people', I mean). Saved.