My first attempt at commenting on this earlier today was a flat out rant . . after I read it I hit delete instead of submit.  Trying again . . .
This incident wouldn't bother me as much if it were the only time it's happened . . but it's not.  There are a lot of wonderful fans in this community .. but as with every group the unpleasant few get a disproportionate share of people's memory cells. 

Other artists that Grace / GPN have worked with have also been treated less than politely by a few of GPN's fans.   It's okay to not like the music,  but I do not understand why some feel the need to go beyond that and make comments that border on personal attacks.  Putting down another artist does not make your favorite look better,  in fact it can have the opposite effect.  
I always want to ask the bashers how they would feel if they went hunting for information on a band they became interested in because of a show . . and found those fans making rude and factually suspect comments about GPN.   Would they be as likely to stay interested in band X  as they would be if those fans were accepting and posting real information  about GPN ?   
I also wonder if it occurs to them that Grace and the rest of the band might not appreciate their fans making derogatory remarks about musicians they are working with.  Given the kind of people we know they are, it seems likely that they would not be pleased by it.  

The 'selling out' whine is nothing new - when I was moving setlists off the old yuku board I ran across comments about the <i>This Is Somewhere</i> album that were not that different than the complaints made when the new record broke last June.  I'm thoroughly enjoying this ride we're on,  but I guess come people just do not like change.  I can understand the desire to hold on to a particular point in time, however wanting to restrict the explorations of a young group of musicians seems a little selfish to me.  Then there's the questioning of what's too commercial (whatever that means) .. changes to the look of the stage .. what everyone is wearing .. and so on and so on and so on . . . 
and now Sly and the Family Stone lyrics have invaded my brain . . . 
http://www.youtube.com/watch?v=Q-ZIVNouSXs