You ain't gotta explain why you were positioned where you were...it's your route and your ass, so it was your call. The honks and engine revs...you just get used to them and resist the urge to do anything but give them a big smile. If words are exchanged, the first words out of your mouth should be "Friend, have you found Jesus?"
But in the case where some idiot pulls over and gets out of his car...you can either take the prudent course of action and continue on as you did, or give him the impression that you are a crazed homeless person who is about to tear off his head, eat his liver then spit it back down his throat...not that I would know anything about that.