I find that a few minutes out of my busy schedule of shooting really does not make ANY difference. Not that you would have to explain the whole process of developing and printing the film of the shot to them but a bit of courtesy goes a long way in the world. Yes you over reacted for a simple explanation. I do not know you personally but from reading your posts you seem like a nice gentleman so the swearing sounds like you were just having a bad day. As for the sunrise @ Lake Louise it has been done by many many people in the past so what you were doing was just an interest not a competition issue. BTW The best shots I have found were the sunsets looking out across the lake. Hope you had good light the whole trip.