Look.
Every human alive has days when they are not stoked for whatever reason. Tanner may have been an asshole, Simon might have been reclusive and pissed because his good friend was just paralyzed, whatever.
Cut these people some slack. Just because they are pros does not mean that they are exempt from the swings of everyday life. Yes, that does mean that they might not treat you perfectly or come off as childish or stupid, but you don't treat everyone else perfectly either.
Personally, I think Tanner is a better representative of the sport and more appealing to me personally because he can do all aspects of skiing really well, and I have yet to see Dumont do much in the big mtn arena (though his segment on the Austrian booters in Reasons was pretty decent). If you are going to judge these pros, remember that they are people first and have bad days too, and that judging them on things is a personal preference and often not worth creating a new thread about an old fake rivalry propogated to make money for ESPN.