We mustn't lose sight of the fact that this is an entertainment show.
Craig critiques professionally, and his points are always worth being listened to by the dancers, if they can hear him through the chorus of pantomime booing.
I watched last night, we at my MIL's for tea, so we all watched, I don;t usually see it - but I did notice that the dancers do listen to Craig becuase his points are not personal, but are accurate.
The rest seem to be taking it lightly, which is fine, it is entertainment, not an audition for the Bolshoi.